JP3041723B2 - High sensitivity and sharpness of silver halide photographic materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver halide photographic light-sensitive material having high sensitivity and excellent image sharpness, a method for forming an image thereof, and a method for photographing the same.

[0002]

BACKGROUND OF THE INVENTION Films used for X-ray photography used for medical diagnosis are generally used in combination with a film and a fluorescent intensifying screen at the time of photography. In this method, in consideration of the influence of X-rays on the human body, X-rays transmitted through a front intensifying screen are further used for a rear intensifying screen in order to effectively use the X-rays.

In recent years, as the sensitivity of films and intensifying screens has been increased, there has been an increasing demand for higher quality images for medical treatment, and in particular, the sharpness is required to know the state of a lesion or an affected part in more detail. There is a strong demand for improved performance.

However, in a silver halide photographic light-sensitive material for X-rays having an emulsion coated on both sides, light emitted from one intensifying screen passes through an adjacent silver halide emulsion layer, and the light is emitted therefrom. Is spread by the support, causing a development that causes a so-called crossover exposure phenomenon of imagewise exposing the silver halide emulsion layer on the opposite side from both sides, which is a major factor in deteriorating the sharpness of the image.

[0005] Reduce crossover exposure from both sides,
Numerous proposals have been made in the past to improve the sharpness, such as JP-A-61-132945 or British Patent 821,352 using a dye in a silver halide emulsion layer or a constituent layer.

Further, improvements have been made on the intensifying screen side in parallel with the film side. For example, silver halide emulsion layers having different color sensitivity are provided on the A side and the B side, and the respective silver halide emulsion layers conform to the color sensitivity. JP-A-2-110538 using a fluorescent intensifying screen having an emission spectrum is disclosed.

However, even with these improved techniques, sharpness deterioration is unavoidable as long as two intensifying screens are used in a double-sided emulsion. In particular, in an X-ray imaging system, oblique incidence of X-rays obliquely incident on the film surface. In photographing, a shift between images on both sides results in markedly degraded sharpness.

[0008] Further, for sharpening, an attempt has been made to provide an emulsion layer only on one side and expose only one side. However, in this method, the sensitivity is low, and an attempt to increase the sensitivity on one side inevitably leads to an increase in the thickness of the photosensitive emulsion layer, and the fixing performance, washing performance or drying speed on one side decreases, and the color There is an inconvenience that the image is deteriorated due to the residual, residual silver and residual hypo, which is not preferable.

The present inventors have proposed a silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides, the emulsion layer on one side (side A) and the emulsion layer on the other side (side B). As a result of various studies on methods for improving the sharpness using a fluorescent intensifying screen only from one side by changing the sensitivity and the amount of coated silver,
Since the (A) plane and the (B) plane are composed of different emulsions, silver contents, binder contents, etc., it was found that the film surface properties were not balanced between the (A) and (B) planes.

For example, if the (A) surface and the (B) surface have different amounts of binder and silver mainly composed of gelatin, respectively, a difference occurs in the tensile strength of the film, curling occurs, and the water content of both surfaces is reduced. Insufficient adjustment causes films to adhere to each other
Unfavorable phenomena, such as the occurrence of (stickiness), were observed.

In recent years, the X-ray film imaging system has been automated, and the automatic transportability of the film has been regarded as one of the important performances. Since the curl and cutout of the film become fatal defects, it is urgent. Improvement was desired.

Further, it is usually very difficult to easily identify and work the front and back surfaces of a film having an emulsion layer on both sides in a dark room, and there is often a possibility of making a mistake.

[0013] This is one of the reasons why films having performance differences between front and back have not been used until now.
Therefore, there is an urgent need to establish a system that can capture an image without using the front and back sides in reverse even if a film having a performance difference between the front and back sides is used.

[0014]

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide a silver halide photographic material for single-sided exposure which has high sensitivity and excellent sharpness.

A second object of the present invention is to provide a single-side exposure X-ray scanner capable of obtaining high image quality with little image deviation even in oblique photographing.
An object of the present invention is to provide a silver halide photographic light-sensitive material for a line and an image forming method thereof.

A third object of the present invention is to provide a silver halide photographic material for X-rays for single-sided exposure which has good film transportability.

A fourth object of the present invention is to provide a light-sensitive material according to the present invention, in which a fluorescent intensifying screen is used on only one side to expose the light-sensitive material only from one side and obtain a halogenated image capable of obtaining a high sharpness image. An object of the present invention is to provide a method for forming an image on a silver photographic light-sensitive material.

A fifth object of the present invention is to provide a photographing method which makes it easy to determine the front and back of a film when the film according to the present invention is inserted into a cassette and does not cause misloading.

[0019]

As a result of intensive studies, the present inventors have found that these objects are achieved as follows, and have accomplished the present invention.

(1) A photosensitive material for single-sided exposure having at least one silver halide emulsion layer on both surfaces of a transparent support, and exposing the photosensitive material only from a high-sensitivity surface and developing it under the following developing conditions: When the exposure is one side, the fog density +
A silver halide photographic material for single-sided exposure, wherein the density at the same exposure position corresponding to the other surface is fog density +0.20 or less when the exposure amount gives a density of 1.60.

Development Processing Conditions Processing was performed in a 45-second processing mode using an automatic developing machine SRX501 (manufactured by Konica Corporation). The development was performed at a developing solution temperature of 35 ° C. and a fixing temperature of 33 ° C. The washing water was supplied at a temperature of 18 ° C. at a rate of 4 l / min. The drying temperature is
Performed at 45 ° C. The environment of the room with the autonomous machine is 25 ° C, 60
%Met.

Formulation of developer Part-A (for finishing 38 l) Potassium hydroxide 1140 g Potassium sulfite 2280 g Sodium hydrogen carbonate 266 g Boric acid 38 g Diethylene glycol 418 g Ethylenediaminetetraacetic acid 61 g 5-Methylbenzotriazole 1.9 g Hydroquinone 1064 g Add water to 9.3 L Finish Part-B (for finishing 38l) Glacial acetic acid 418g Triethylene glycol 418g 1-phenyl-3-pyrazolidone 100g 5-nitroindazole 9.5g Add water to finish to 1.0l Part-C (for finishing 38l) Glutaraldehyde ( 304g Sodium metabisulfite 389g Add water to make up to 770ml Starter Glacial acetic acid 230g Potassium bromide 200g Add water to make up to 1.5l Developing solution preparation method Put 20l of 18 ℃ water into replenisher stock tank Add the above Part-A, Part-B, Part-C sequentially while stirring, and finally add water and water. Added aqueous solution of potassium, pH at 38l
Was adjusted to 10.53 at 25 ° C. Apply this replenisher for 24 hours 25
After the mixture was allowed to stand at 0 ° C., the above starter was added at a rate of 20 ml per liter, and then filled in a developing tank of an automatic developing machine manufactured by Konica Corporation. The pH of the developer at this time was 10.26 at 25 ° C.

The developing replenisher was 362 m / m ² of the sample of the present invention.
l refilled.

Fixer Formulation Part-A (for finishing 38 l) Ammonium thiosulfate 6080 g disodium ethylenediaminetetraacetate 0.76 g dihydrate sodium sulphite 456 g boric acid 266 g sodium hydroxide 190 g glacial acetic acid 380 g Add water to finish 9.5 l B (for finishing 38 l) Aluminum sulfate (in terms of anhydrous salt) 570 g sulfuric acid (50 wt%) 228 g Add water to finish 1.9 l Fixer preparation method Add 20 l of water at 18 ° C to the replenisher stock tank and stir as described above. Part-A and Part-B were sequentially added, and finally water and acetic acid were added. The pH was adjusted to 4.20 at 38 ° C with 38 l. The fixing replenisher was allowed to stand at 25 ° C. for 24 hours, and then filled in a fixing tank of an automatic developing machine manufactured by Konica Corporation. Fixing replenishment was performed by replenishing 640 ml per 1 m ² of the sample of the present invention.

(2) The silver halide photographic material for single-sided exposure according to (1), wherein the surface on the side where the density is increased is a high sensitivity surface.

(3) The silver halide photographic material for single-sided exposure according to (2), wherein the sensitivity of the high-sensitivity surface is 1.5 to 10 times different from the sensitivity of the other low-sensitivity surface.

(4) The one-sided surface according to (2), wherein the amount of silver on the high-sensitivity surface is 1.1 to 5.0 times the amount of silver on the low-sensitivity surface.
Silver halide photographic material for exposure .

(5) The projected area of all silver halide grains on the high-sensitivity surface of 50% or more is 0.50 μm or more and 2.00 μm or more.
The silver halide photographic material for single-sided exposure according to item (2), which has a particle size of not more than m.

(6) The item (2) according to item (2), wherein 60% or more of the projected area of all silver halide grains on the high-sensitivity surface is a normal crystal monodisperse and / or twin tabular grains having an aspect ratio of 5 or more. Silver halide photographic material for single-sided exposure .

(7) A silver halide photographic light-sensitive material for single-sided exposure having silver halide emulsion layers on both surfaces of a transparent support and having different sensitivities on both surfaces. An image forming method in which light is exposed to light having a wavelength of 300 nm or more capable of forming a latent image from the sensitivity surface side and developed.

(8) A silver halide photographic material for single-sided exposure having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides. An image is formed by exposing from the sensitive surface side with light having a wavelength of 300 nm or more capable of forming a latent image, and developing to form an image. The amount of transmitted light that reaches the surface is 12% or more and 75% of the exposure amount on the sensitive surface
The following silver halide photographic material for single-sided exposure according to item (2):

(9) A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides for single-sided exposure. When exposed from the sensitive surface side with light having a wavelength of 300 nm or more capable of forming a latent image, the amount of transmitted light that passes through the support from the high sensitive surface and reaches the interface between the support and the low sensitive emulsion layer has a high sensitivity surface. 12% or more and 75% or less of the exposure amount to the surface, and when the exposure amount that gives a fog density of +1.60 to the highly sensitive surface after the development processing is given, the corresponding same exposure on the other surface 2. The silver halide photographic material for single-sided exposure according to (2), wherein the density at the position is not more than fog + 0.20.

(10) A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides for single-sided exposure. Sensitivity surface
Exposure from the side with light having a wavelength of 300 nm or more capable of forming a latent image, followed by development processing to form an image. The image passes through the support from the high-sensitivity surface and reaches the interface between the support and the low-sensitivity emulsion layer. The transmitted light amount is 12% or more of the exposure amount on the surface of the sensitive surface.
The method for forming an image of a silver halide photographic light-sensitive material for single-sided exposure according to (2), which is 5% or less.

(11) An exposure method in which light having a wavelength of 300 nm or more capable of forming a latent image is exposed from a highly sensitive surface by fluorescence emitted by absorption of X-rays. The amount of transmitted light that passes through and reaches the interface between the support and the low-sensitivity emulsion layer is 1% of the exposure amount on the surface of the high-sensitivity surface.
The method for forming an image of a silver halide photographic light-sensitive material for single-sided exposure according to (2), which is at least 2% and at most 75%.

(12) A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides for single-sided exposure. An image forming method in which light is exposed only from the high sensitivity side with light having a wavelength of 300 nm or more capable of forming a latent image from the sensitivity side.

(13) A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides for single-sided exposure. _GH (Ag / gelatin), which is 1.5 to 10 times as high as the sensitivity of the low-sensitivity surface, and is the weight ratio of silver to gelatin on the high-sensitivity surface
_GL (Ag) whose value is the weight ratio of silver to gelatin on the low sensitivity surface
/ Gelatin) value, and the polyhydric alcohol is 5.0 × 10 ⁻⁵ to 5.0 × 10 ⁻³ mol per 1 g of gelatin.
A silver halide photographic material for single-sided exposure .

[0037] (14) film and the cassette is, the Fi
There is a notch of irregular shape at a certain point on the end of the lum
And the cassette has irregularities at the edge of the film.
The object is achieved by the photographing method using a silver halide photographic light-sensitive material for single-sided exposure according to item (3) having a shape substantially matching the shape .

Conventionally, in the case of a film having substantially the same emulsion layer on both sides of the support, in the case of image observation, a front image directly entering the eye and an image of the back surface passing through the support base and entering the eye are added. It is looking at things.

In general, X-ray imaging is performed such that the X-ray incidence angle is 90 ° with respect to the film surface. However, in some cases, imaging is performed obliquely. The “shift” between the front and back images is enlarged, and the sharpness is significantly reduced due to the influence of the crossover light from both sides described above.

The conventional system observes the total of the substantially uniform images on both sides as described above. However, as a result of various studies, the present inventor has found that the image is shifted to one of the front and back sides according to the density region. It has been found that the sharpness of the image in the low density range to the middle density range can be remarkably improved.

When the emulsion layer is provided only on one side, the sharpness is not deteriorated, but the same processing performance as when using both sides is required to obtain the same amount of silver halide emulsion. The deterioration of the image is remarkable, and there are problems such as a decrease in sensitivity, residual color, and deterioration of the stored image due to residual silver and residual hypo.

In the present invention, an emulsion layer is coated on both sides of a support, but is different from the conventional method in that a sensitivity difference is made between photosensitive emulsions on both sides. In addition, when photographing, exposure is performed only from one side.

The sensitivity of the emulsion layer on one side (side A) of the silver halide photographic light-sensitive material according to the present invention is as follows.
The sensitivity is preferably 1.5 times or more, more preferably 2.0 to 10 times higher than the sensitivity of the emulsion layer on the side (2).

The weight ratio between silver and gelatin on the (A side) is larger than the weight ratio between silver and gelatin on the (B) side, and preferably 1.2 times or more.

The sensitivity in the present invention is determined by a light source for photographing the photosensitive material used in the present invention.

For example, for a regular X-ray film, the measurement is performed using a fluorescent intensifying screen for photographing a regular X-ray film, and for an ortho-X-ray film, the measurement is performed using a fluorescent intensifying screen for photographing an ortho-X-ray film. If a system (panchromatic, infrared ray, etc.) using another light source appears in the future, the measurement will be performed using the light source used in combination with the photosensitive material.

The value of photosensitivity is given as the reciprocal of the X-ray dose required to obtain an optical density of 40% of the highest density (not including the density of the support) obtained by development.

The silver halide photographic material according to the present invention can be exposed to light having a wavelength of 300 nm or more, which has a latent image forming ability, from a high sensitivity surface and developed to obtain an image.

As light having a wavelength of 300 nm or more, for example, in the case of a photosensitive material for laser imaging, the wavelength of a laser beam is 820 nm or 780 nm for semiconductors, and 633 for He-Ne.
A light source of nm or the like can be used. Also, it can be applied to indirect X-ray films.

When the density of information is substantially concentrated to 2.0 or less from a photograph such as a medical black-and-white photograph, the depiction of a low-density portion is performed substantially on the light source side surface. This is very effective as a means for preventing the sharpness of a photograph from deteriorating during photography and observation.

Another object of the present invention is to increase the sensitivity of a film for a single-sided exposure system. To obtain high sensitivity, the desired sensitivity and maximum density cannot be obtained unless a large amount of silver halide having a large grain size is coated, but as described above, a large amount of silver halide layer is provided on one side of the support. And development, fixing,
The processability such as washing and drying deteriorates, which is contrary to the reality that the photographic constituent layers are being made thinner for rapid processing.

The total amount of silver halide on the side constituting the high-sensitivity layer of the light-sensitive material of the present invention is preferably such that silver halide grains having a larger average particle diameter than the low-sensitivity layer are used. Therefore, it is preferable to increase the amount of silver halide attached on the high-sensitivity layer side.

In order to achieve the object of the present invention, the total amount of silver halide constituting the high-speed layer is 1.1 times or more, preferably 1.2 times or more that of the low-speed layer. Preferably, it is 5 times or less. If it is more than that, the advantage that the silver halide of the photosensitive material for single-sided exposure is provided on both sides as in the present invention is reduced.

In the silver halide photographic light-sensitive material of the present invention, the amount of light transmitted through the support from the high-sensitivity surface and reaching the low-sensitivity surface (crossover light) during one-sided exposure from the high-sensitivity surface Is preferably larger than that of a normal double-sided photosensitive material for X-ray photography. In practice, the transmitted light from the light source used is 12%
To 75% or less, more preferably 16% or more and 65% or less. When the transmitted light increases, sharpness is deteriorated.

Further, 1 g of gelatin in the light-sensitive material constituting layer
It is preferable to contain at least one of 5.0 × 10 ^{−5 to} 5.0 × 10 ⁻³ mol of a polyhydric alcohol compound per one.

The polyhydric alcohol used in the present invention includes
Alcohols having 2 to 12 hydroxyl groups in the molecule, having 2 to 20 carbon atoms, and in which the hydroxyl groups and the hydroxyl groups are not conjugated by a conjugated chain, that is, an oxidized form in which an oxidized form cannot be written are preferable. Further, those having a melting point of 50 ° C. or more and 300 ° C. or less are preferable.

S _B ′ / S _B is defined as follows. S _B is B
S _B ′ is the sensitivity of surface B only when exposure is performed only from surface A (high sensitivity surface), and S _B ′ is the sensitivity of surface B only when exposure is performed only from surface (low sensitivity surface).

In the present invention, S _B '/ S _B is preferably 0.12 or more and 0.75 or less. If it is less than 0.12, light transmitted from the high-sensitivity surface to the low-sensitivity surface is small, and the image forming efficiency on the low-sensitivity surface is extremely deteriorated. Also, since the light absorption in the emulsion layer on the sensitive surface is large, the light exposure near the support is greatly reduced compared to the surface near the emulsion layer on the sensitive surface. When the contrast of the high-sensitivity surface is lowered due to the change of the high-sensitivity surface, when obtaining a high contrast at a low maximum density of the high-sensitivity surface as in the sample of the present invention,
Very disadvantageous.

On the other hand, if it exceeds 0.75, the sharpness is reduced due to scattering in the high-sensitivity surface, and the amount of light transmitted to the low-sensitivity surface is too large, so that the high-sensitivity surface is required to obtain a sufficient density. When the exposure amount is given, an image is formed on the low-sensitivity surface due to a large amount of light transmitted to the low-sensitivity surface, which tends to cause a decrease in sharpness, which is not preferable.

The following are specific examples of polyhydric alcohols which can be preferably used in the practice of the present invention, but those which can be used in the present invention are not limited to these specific examples.

No. Compound name Melting point (° C.) B-1 2,3,3,4-tetramethyl-2,4-pentanediol 76 B-2 2,2-dithimer-1,3-propanediol 126-128 B-3 2,2-dimethyl-1,3-pentanediol 60 to 63 B-4 2,2,4-trithimer-1,3-pentanediol 52 B-5 2,5-hexanediol 43 to 44 B- 6 2,5-dimethyl-2,5-hexanediol 92-93 B-7 1,6-hexanediol 42 B-8 1,8-octanediol 60 B-9 1,9-nonanediol 45 B-10 1 , 10-decanediol 72-74 B-11 1,11-undecanediol 62-62.5 B-12 1,12-dodecanediol 79-79.5 B-13 1,13-tridecanediol 76.4-76.6 B-141, 14-tetradecanediol 83-85 B-15 1,12-octadecanediol 66-67 B-16 1,18-octadecanediol 96-98 B-17 cis-2,5-dimethyl-3-hexene-2,5- Diol 69 B-18 trans-2,5- Methyl-3-hexene-2,5-diol 77 B-19 2-butyne-1,4-diol 55 B-20 2,5-dimethyl-3-hexyne-2,5-diol 95 B-21 2,4 -Hexadiyne-1,6-diol 111-112 B-22 2,6-octadiyne-1,8-diol 88.5-89.5 B-23 2-methyl-2,3,4-butanetriol 49 B-24 2,3 , 4-hexanetriol about 47 B-25 2,4-dimethyl-2,3,4-pentanetriol 89 B-26 2,4-dimethyl-2,3,4-hexanetriol 75 B-27 pentanemethylglycerin 116 ~ 117 B-28 2-Methyl-2-oxymethyl-1,3-propanediol 199 B-29 2-Isopropyl-2-oxymethyl-1,3-propanediol 83 B-30 2,2-dihydroxymethyl- 1-butanol 58 B-31 erythritol 126 B-32 D-trait 88 B-33 L-trait 88-89 B-34 rac-trait 72 B-35 pentane erythritol 260-265 B-36 1,2,3,4 -Pentantetro 106 B-37 2,3,4,5-hexane tetrol 162 B-38 2,5-dimethyl-2,3,4,5-hexane tetrol 153 to 154 B-39 1,2,5,6 -Hexane tetrol 95 B-40 1,3,4,5-Hexane tetrol 88 B-41 1,6- (erythro-3,4) -hexane tetrol 121-122 B-42 3-Hexene-1, 2,5,6-tetrol 80-82 B-43 3-hexyne-1,2,5,6-tetrol 113-114.5 B-44 adonitol 102 B-45 D-arabitol 102 B-46 L-arabitol 102 B- 47 rac-arabitol 105 B-48 xylitol 93-94.5 B-49 mannitol 164 B-50 dulcitol 188.5-189 All of the above compounds according to the present invention are readily available as commercial products.

The silver halide photographic material of the present invention has a gelatin content per side of 1.5 g / m ^{2 to} 6.5 g / m ^2.
2 Preferably, a ^{2.0g / m 2 ~4.5g / m 2} .

The present invention can be applied to conventional single-sided emulsion photosensitive materials for CRT photography, laser printers, laser imager photography, and mammography.

A further feature of the present invention is that the light-sensitive material according to the present invention is exposed only from one side when it is exposed. In this case, the film may be located on either side of the X-ray incident side, but it is preferable that the surface of the high sensitivity layer comes to the incident side.

When a fluorescent intensifying screen is used, the fluorescent intensifying screen may be set on either side of the film, but it is preferable to set the fluorescent intensifying screen on the high-sensitivity emulsion layer side in order to obtain the desired effects of the present invention. To play.

Next, the main ones of the preferred embodiments of the present invention will be described below.

The silver halide grains used in the high-sensitivity emulsion surface of the present invention are preferably silver iodobromide or silver iodochlorobromide having a silver iodide content of 3 mol% or less. More preferably, it is a silver iodochlorobromide emulsion containing 0.1 to 2.5 mol% of silver iodide, 97.5 mol% or more of silver bromide, and 0 to 2.0 mol% of silver chloride.

[0068] The silver halide coating weight of the high sensitivity surface is in the range of 4.0 g / m ² or less is preferable 1.0~3.5g / m ² of silver amount conversion, it's low sensitivity surface, 3.0 g / m ² or less And preferably 0.1 to
It is in the range of 2.5 / gm ² .

In the present invention, fog refers to the sum of the density of a support after development processing and the density of developed silver in an unexposed portion, and is a so-called gloss fog.

The highest density of the light-sensitive material of the present invention is preferably 1.9 or more when exposed from the high-sensitivity surface side.
More preferably, it is 2.0 or more and 3.4 or less.

The maximum density of the low-sensitivity surface is preferably 0.4 or more when exposed from the low-sensitivity surface side, and more preferably 0.5 or more and 2.5 or less.

The light-sensitive material of the present invention forms a low-density portion and a medium-density portion (approximately 2.0 density) substantially only on the high-sensitivity surface by exposure from the high-sensitivity surface, and forms the high-sensitivity surface and the support. The purpose is to expose a low-sensitivity surface with transmitted light to form a higher-density portion. The density range that is particularly useful for diagnosis in medical images is from fog density to density
It is in the range of 1.6 to 2.3. The high-concentration region having a concentration of 1.6 to 2.3 or more often acts effectively to make it easier to see a site useful for diagnosis at a concentration of 1.6 to 2.3 or less than the diagnosis itself at that site. Therefore, there is almost no problem even if a high-density portion is formed in an image with poor sharpness formed by crossover light from only one side. Rather, by forming an image from fog density to a density range of 1.6 to 2.3 on one side of only the high density surface, there is no influence of crossover light, and an image without sharpness reduction can be formed even in oblique shooting. .

Therefore, the light-sensitive material of the present invention is not only a light-sensitive material having a difference in sensitivity between a high-sensitivity surface and a low-sensitivity surface, but also has a density of 1.6 to 1.6 depending on the use of the light-sensitive material.
It is preferable that the low-sensitivity surface does not form a substantial image in the low exposure region until 2.3 is formed.

In general, the density on the high-sensitivity surface is (fog + 1.
When exposure with a density of 60) is given from a high-sensitivity surface, the density of the low-sensitivity surface should be (fog + 0.20) or less, so that the light-sensitive material can be used as a diagnostic image from low to medium density. An image with extremely high sharpness can be obtained in the density region. The light-sensitive material of the present invention is most preferably used for forming an image on a low-sensitivity surface by transmitting light from a high-sensitivity surface. It is preferably more than the double-sided photosensitive material for radiography, and more preferably in the range of 12% to 75%.

The values such as sensitivity, gamma, fog and maximum density referred to in the present invention are determined by the processing agents and processing conditions described in the examples of the present invention.

As described above, the silver halide photographic light-sensitive material according to the present invention has a feature that a silver halide emulsion layer is coated on both sides of a support, and the sensitivity of the emulsion is different between front and back. I have.

Therefore, unlike conventional double-sided films, it is necessary for the user to be able to easily determine the sensitivity of the front and back of the film when handling the film, loading the film and the fluorescent intensifying screen during photographing, or during development.

When the film is loaded into the cassette, the photosensitive surface of the film and the surface of the intensifying screen must be in close contact with each other. Each film maker is devised, for example, to provide a notch at a specific portion of the film in order to facilitate the front / back determination.

However, the shape and position of the notch are different depending on the type of film and the manufacturer, and when loading in a darkroom, it is easy to cause erroneous loading, which often leads to serious mistakes. Was.

The light-sensitive material and the cassette are achieved by an X-ray imaging system having substantially the same irregularities.

The above-mentioned cassette refers to a cassette usually used for X-ray photography, and refers to a film container made of aluminum, carbon, lead or the like.

The unevenness in which the cassette and the photosensitive material have substantially the same shape refers to a cassette that notches a predetermined portion of the photosensitive material within a range that does not impair the photographing screen and matches the notch shape of the film. . Although the shape and position of the unevenness are not particularly limited, a shape and position which are minimum and may be any of upper, lower, left and right as long as the object effect of the present invention can be obtained, and which can easily match both are used.

Further, a conventional cassette may be used to fix a substance having an irregular shape (arbitrary shape) conforming to the notch of the film. FIG. 1 shows an example of a plan view of a current film and cassette. (a) is a film and (a ') is a film cassette.

FIG. 2 is a side view of a current film cassette.

FIG. 3 is a plan view of a film and a film cassette in the X-ray imaging system according to the present invention.
(3 examples).

(B) of the drawing shows a film cassette having a notch formed at the left end of the film coated with the emulsion and having a substantially identical shape to the film.
It is a top view of (b ').

Similarly, a film (c) and a film cassette (c ') provided with a concave notch at the left end of the film, and a cut-off notch (d) and a film cassette (d') provided at the left end of the film. ). Conventionally, the left and right of the film at the time of shooting can be determined at the time of interpretation after development.
A mark that absorbs X-rays was pasted on the cassette,
The photographing system according to the present invention has an advantage that the photographing position can be easily determined by the notch of the film without the necessity. Furthermore, unlike the conventional case, the unevenness position of the film can be recognized by the cassette itself even from the outside, so that not only the elimination of erroneous loading but also the advantage during photographing and image reading is proved to be extremely useful for preventing misdiagnosis.

The film cassette according to the present invention may be of the same material, construction, etc., which has been generally used in the prior art. Preferably, the film cassette is provided with a film receiving frame in the cassette which matches the unevenness of the film. It is more preferable that the film has a shape conforming to the unevenness of the film, including the outer frame of the cassette, so that the object effect of the present invention can be achieved more favorably. For example, the cassette shown in FIG. 3 is provided with irregularities not only inside the cassette but also outside the cassette so that irregularities inside the cassette can be identified.

However, there is no particular need to provide such a case. In some cases, a marking such as a seal may be provided on the outer surface of the cassette so as to be able to identify the internal unevenness position.

The emulsion used in the silver halide photographic light-sensitive material of the present invention may be any of silver halides such as silver iodobromide, silver iodochloride and silver iodochlorobromide. From the viewpoint of being obtained, silver iodobromide is preferred.

The silver halide grains in the photographic emulsion were all isotropically grown, such as cubic, octahedral, and tetrahedral, or polyhedral, such as spherical, and had surface defects. It may be composed of twins, or a mixed type or a composite type thereof. The size of these silver halide grains may be as large as 0.1 μm or less to 20 μm.

The emulsion used in the silver halide photographic light-sensitive material of the present invention can be produced by a known method. For example, Research Disclosure (RD) No. 17643 (December 1978)
-Emulsion Preparation a on page 22-23
ND types) and (RD) No. 18716 (November 1979), page 648.

Emulsions of the silver halide photographic light-sensitive material according to the present invention can be prepared, for example, by the method described in "The Theory of the Phot" by TH James.
"graphic process" 4th edition, published by Macmillan (1977) 38
Methods described on pages 104 to 104, "Photographic Emulsion Chemistry" by GFDauffin, "Photographic Emulsion Chemistry", Focal pres
s Publishing Company (1966), P. Glafkides, "Physics and Chemistry of Photography" Chimie et physique photographique ", Paul Montel
"Making and coating photographic Emulsio", published by the company (1967), VLZelikman et al.
It is prepared by the method described in n "Focal press (1964).

That is, mixing conditions such as a forward mixing method, a reverse mixing method, a double jet method, a controlled double jet method, a conversion method, a core / shell method, etc., under solution conditions such as a neutral method, an acidic method, and an ammonia method. Can be produced using the above-mentioned particle preparation conditions and a combination method thereof.

One preferred embodiment of the present invention is a monodisperse emulsion in which silver iodide is localized inside the grains.

Examples of the silver halide emulsion preferably used in the present invention include, for example, JP-A-59-177535 and JP-A-61-1163.
No. 47, No. 61-132943, No. 63-49751 and the like, and internal high iodine type monodispersed particles. The habit of the crystal is cubic, tetrahedral, octahedral and intermediate (1,1,1)
The plane and the (1,0,0) plane may be arbitrarily mixed.

The monodisperse emulsion referred to here means a conventional method.
For example, when measuring the average particle diameter, at least 95% of the particles by number or weight are within ± 40% of the average particle diameter,
The silver halide grains are preferably within ± 30%.
The grain size distribution of silver halide may be either a monodisperse emulsion having a narrow distribution or a polydisperse emulsion having a wide distribution.

The definition of monodispersity described here is:
It is described in JP-A-60-162244, and has a coefficient of variation relating to particle size of 0.20 or less.

The crystal structure of silver halide may have different silver halide compositions on the inside and the outside.

The emulsion as a preferred embodiment is a core / shell type monodisperse emulsion having a two-layer structure comprising a low iodine shell layer in a high iodine core portion.

The silver iodide content of the high iodine part is 20 to 40 mol%, particularly preferably 20 to 30 mol%. Methods for producing such monodispersed emulsions are known, for example, J. Phot. Sic. 12. pages 242 to 251.
(1963), JP-A-48-36890, JP-A-52-16364, and JP-A-55-14
2329, 58-49938, UK Patent 1,413,748, U.S. Patent
Nos. 3,574,628 and 3,655,394.

As the above monodisperse emulsion, a seed crystal was used.
An emulsion in which grains are grown by supplying silver ions and halide ions using the seed crystal as a growth nucleus is particularly preferable. As a method for obtaining a core / shell emulsion, for example, British Patent No. 1.027.146, US Pat. No. 3,505,068, and US Pat.
Nos. 444,877 and JP-A-60-14331 describe in detail.

As another grain form used in the present invention, the silver halide emulsion is preferably tabular grains having an aspect ratio of 3 or more.

The advantages of such tabular grains are that, for example, British Patent No. 2,112,157 and US Pat. No. 4,439,5 disclose that improved spectral sensitization efficiency and improved graininess and sharpness of an image can be obtained.
No. 20, No. 4,433,048, No. 4.414,310, No. 4,434,226
No., JP-A-58-113927, JP-A-58-127921, JP-A-63-1383
Nos. 42, 63-284272, 63-305343, etc., and emulsions can be prepared by the methods described in these publications.

The above-mentioned emulsions are either emulsions of a surface latent image type in which a latent image is formed on the grain surface, an internal latent image type in which a latent image is formed inside the grain, and a type in which a latent image is formed on the surface and inside. You may. These emulsions may use a cadmium salt, a lead salt, a zinc salt, a thallium salt, an iridium salt or a complex salt thereof, a rhodium salt or a complex salt thereof, an iron salt or a complex salt thereof at the stage of physical ripening or grain preparation. The emulsion may be subjected to a water washing method such as a Nudel washing method or a flocculation sedimentation method to remove soluble salts. As a preferred water washing method, for example, a method using an aromatic hydrocarbon-based aldehyde resin containing a sulfo group described in JP-B-35-16086, or G3, G8 exemplified by coagulated polymer agents described in JP-A-63-158644. The method used is a particularly preferred desalting method.

In the emulsion according to the present invention, various photographic additives can be used before and after physical ripening or chemical ripening. Known additives include, for example, Research Disclosure No. 17643 (December 1978) and N
o. 18716 (November 1979). The following table shows the types and locations of the compounds shown in these two research disclosures.

[0107] Examples of the support that can be used in the light-sensitive material according to the present invention include the aforementioned RD-17643, page 28 and RD-18716, page 64.
Those described in the left column on page 7 can be mentioned.

A suitable support is a plastic film or the like, and the surface of the support may be generally provided with an undercoat layer, or subjected to corona discharge, ultraviolet irradiation, etc. in order to improve the adhesion of the coating layer. Then, the emulsion according to the present invention can be coated on both sides of the support thus treated.

[0109]

Embodiments of the present invention will be described below. However, needless to say, the present invention is not limited to the embodiments described below.

Example 1 (1) Preparation of Monodisperse Grains Silver iodobromide containing 2.0 mol% of silver iodide having an average particle size of 0.2 μm is cubic and has a good coefficient of variation of 0.15, which is a measure of monodispersity. Silver iodobromide containing 30 mol% of silver iodide is grown at a pH of 9.8 and a pAg of 7.8 with the monodisperse emulsion grains as nuclei.
8.2, pAg9.1 add equimolar amounts of potassium bromide and silver nitrate,
1 having an average grain size of 0.375 μm, 0.64 μm, 1.22 μm, and 1.88 μm such that silver iodobromide grains having an average silver iodide content of 2.2 mol% are obtained.
Emulsions consisting of four types of monodisperse emulsion grains having a tetrahedral variation coefficient of 0.17, 0.16, 0.16, and 0.17, respectively, were prepared, and designated as -1, -2, -3, and -4, respectively.

The emulsion was subjected to desalting of excess salts by a usual coagulation method. That is, while maintaining the temperature at 40 ° C., a formalin condensate of sodium naphthalenesulfonate and an aqueous solution of magnesium sulfate were added to cause aggregation, and the supernatant was removed.

(2) Preparation of tabular grain emulsion 5.5 l of 1.5% gelatin solution containing 0.17 mol of potassium bromide
While stirring at 80 ° C. and pH 5.7, 2.1 mol of potassium bromide and 2.0 mol of silver nitrate were added as a solution over 3 minutes by a double jet method. pBr was kept at 0.8. (0.53% of the total silver nitrate used was consumed.) The addition of the potassium bromide solution was stopped and the silver nitrate solution continued to be added for 4.6 minutes. (This consumes 8.6% of the total silver nitrate used.) Then, a potassium bromide solution and a silver nitrate solution were added simultaneously for 12 minutes. During this time, the pBr was maintained at 1.15, and the addition flow rate was accelerated so that the completion time was 2.3 times the start time. (43.6% of the total silver nitrate used was consumed.) The addition of the potassium bromide solution was stopped and the silver nitrate solution was added for 1 minute. (Consumes 4.7% of the total silver nitrate used.) A 2.1 molar solution of potassium bromide containing 0.55 mole of potassium iodide was added along with the silver nitrate solution over 12.0 minutes. During this time
The pBr was maintained at 1.7 and the flow rate was accelerated at completion to 1.5 times the starting rate. (Consumes 35.9% of the total silver nitrate used.) 1.5 g / mol A of sodium thiocyanate was added to this emulsion.
g was added and held for 25 minutes. 0.60 mol of potassium iodide and silver nitrate were added in a solution by a double jet method at an equal flow rate for about 5 minutes until the pBr reached 3.0. (About 6.6% of the total silver nitrate used was consumed.) The amount of total silver nitrate consumed was about 11 mol. Thus, an emulsion containing tabular silver iodobromide grains having an average grain diameter of 1.80 μm and an aspect ratio of about 9: 1 was prepared.

The grains had a total projected area of 80 of the silver iodobromide grains.
% Or more were tabular grains.

Sample Preparation, Processing and Evaluation Each of the obtained silver halide emulsions of -1, -2, -3, -4 and -5 had a volume per mole of silver of 500 m.
After adding pure water to 55 ° C., the mixture was heated to 55 ° C., and the total amount of the spectral sensitizing dyes A and B described below in a weight ratio of 200: 1 was 820 mg-1 per mol of silver halide and -2 mg per mol of silver halide. 600mg, -3
Was added to 360 mg and -4 to 500 mg, and to 600 mg.

[0115] The ammonium thiocyanate per mole of silver -1 4 × 10 ^-3 mol after 10 minutes, -2 2 × 10 ^-3 mol, -3 1 × 10 ^-3 mol, -4 1.6 × 10 ^-3 mol,
There was added 3 × 10 ^-3 mol, was started more appropriate amount of added chemical ripening and chloroauric acid hypo.

At this time, the pH was 6.15 and the silver potential was 50 mv.

15 minutes before the end of chemical ripening (70 minutes from the start of chemical ripening)
Minutes later), add 200 mg of potassium iodide per mole of silver,
After 10 minutes, 10% (wt / vol) acetic acid was added to lower the pH to 5.6 and to maintain the pH for 5 minutes, after which potassium hydroxide was added.
Add 0.5% (wt / vol) solution to bring the pH back to 6.15, then
4-Hydroxy-6-methyl-1,3,3a, 7-tetrazaindene was added to terminate chemical ripening.

The obtained emulsions -1, -2, 3,
-4 was mixed as shown in Table 1, and the emulsion additives described later were added to prepare a prepared solution.

The pH after preparing the photographic emulsion coating solution was 6.4.
It was prepared using sodium carbonate and potassium bromide so that the silver potential was 74 mV (35 ° C.).

Using this emulsion coating solution, a sample was prepared as follows. That is, the photographic emulsion layer has a gelatin amount of 2.0 g / m ² on both the high-speed emulsion layer side and the low-speed emulsion layer side,
The amount of silver halide was adjusted to the amount shown in Table 1 in terms of silver.

Further, a protective layer solution was prepared using the additives described below. The protective layer performs a simultaneous double side coated on the support at a speed per minute 80m using two slide hopper type coaters with the emulsion layer prepared in the such that the 1.15 g / m ² as a weight with gelatin, 2 After drying for 20 minutes, a sample was obtained.
As a support, a copolymer aqueous dispersion obtained by diluting a copolymer composed of three monomers of glycidyl methacrylate 50% by weight, methyl acrylate 10% by weight, and butyl methacrylate 40% by weight so as to have a concentration of 10% by weight was used. A blue-colored polyethylene terephthalate film base having a concentration of 0.15 for a 175 μm X-ray film applied as an undercoat liquid was used.

The spectral sensitizing dyes used in the sample preparation are as follows.

Spectral sensitizing dye A Anhydride of sodium 5,5'-dichloro-9-ethyl-3,3'-di- (3-sulfopropyl) oxacarbocyanine Spectral sensitizing dye B 5,5'- Di- (butoxycarbonyl) -1,1'-diethyl-3,
The followings are the additives used for 3'-di- (4-sulfobutyl) benzimidazolocarbocyanine sodium salt anhydride and emulsion (photosensitive silver halide coating solution). The amount of addition is shown in an amount per mole of silver halide.

1,1-Dimethylol-1-bromo-1-nitromethane 70 mg t-butyl-catechol 400 mg polyvinylpyrrolidone (molecular weight 10,000) 1.0 g styrene-maleic anhydride copolymer 2.5 g nitrophenyl-triphenylphosphonium chloride 50 mg 1 3- sodium dihydroxybenzene-4-sulfonic acid ammonium 4g 2-mercaptobenzimidazole-5-sulfonic acid _{1.5mg C 4 H 9 OCH 2 CH} (OH) CH 2 N (CH 2 COOH) 2 1g 1- phenyl-5 -Mercaptotetrazole 15m
g

[0125]

Embedded image

* (Dye emulsified dispersion) 1.2 g Additives used in the protective layer solution are as follows. The amount of addition is indicated by the amount per liter of the coating solution.

Lime-treated inert gelatin 68 g Acid-treated gelatin 2 g Sodium-i-amyl-n-decylsulfosuccinate 0.3 g Polymethyl methacrylate, matting agent having an area average particle diameter of 3.5 μm 1.1 g Silicon dioxide particles Area average particle diameter 1.2 μm 0.5 g Ludox AM (manufactured by DuPont) (colloidal silica) 30 g 2% aqueous solution of 2,4-dichloro-6-hydroxy-1,3,5-triazine sodium salt (hardener) 10 ml 40% aqueous glyoxal _{(hardener) 1.5ml (CH 2 = CHSO 2} CH 2) 2 O ( _{hardener) 500mg C 12 H 25 CONH (} CH 2 CH 2 O) 5 H 2.0g

[0128]

Embedded image

* Dye emulsified dispersion was prepared as follows.

The following dyes (10 kg each) were weighed and dissolved at 55 ° C. in a solvent consisting of 28 l of tricresyl phosphate and 85 l of ethyl acetate. This is called an oil-based solution. On the other hand, 1.35 kg of anionic surfactant (AS below) at 45 ° C
Then, 270 ml of a 9.3% gelatin aqueous solution dissolved in was prepared. This is called an aqueous solution.

The oil-based and water-based solutions were placed in a dispersion vessel and dispersed while controlling the temperature of the solution to 40 ° C.

To the obtained dispersion, 8 g of the following additive C, 16 l of a 2.5% aqueous solution of phenol and water were added to finish the dispersion to 240 kg, and then cooled and solidified.

[0133]

Embedded image

The area average particle diameters of the obtained dispersions were all 0.
It was within the range of 12 to 0.14 μm.

In the measurement of the sensitivity of the obtained sample No. 1, the fluorescence intensifying screen KO-250 (manufactured by Konica Co., Ltd.) was used for the single back method using only the back and the back (only the intensifying screen was used for only one side). ), The fluorescent intensifying screen was brought into contact with the high-sensitivity emulsion layer side (side A), and the low-sensitivity emulsion layer side (B
And (I) and (I-II), respectively, were subjected to development processing to obtain samples (I-I) and (I-II).

At this time, a black coating having a high light absorptivity was applied to the side of the cassette where no intensifying screen was present.

For the photographing, X-rays were irradiated for 0.05 seconds at a tube voltage of 90 KVP and 20 mA, and a sensitometric curve was prepared by a distance method to determine the sensitivity, maximum density and gamma.

The development was carried out using an automatic developing machine SRX-501 (manufactured by Konica Corporation) with a developing solution and a fixing solution having the following composition. The developing temperature was 35 ° C., the fixing temperature was 33 ° C., and the washing water was at a temperature of 18 ° C. At 1.5 ° C. at 1.5 ° C., all processing steps were processed in a 45 second mode.

The sensitivity of the side A was determined by removing the photosensitive layer on the side B from the sample (II) with a protease. Similarly, the photosensitive layer on the side A was removed from the sample (I-II). Thus, the sensitivity of the surface B is required. Also, the total sensitivity can be determined from the sample (II).

The sensitivity value was obtained by multiplying the value obtained by subtracting the support concentration from the maximum concentration by 0.4, and further calculating the reciprocal of the X-ray dose required to obtain a concentration obtained by adding the support concentration. Sample No.
The sensitivity was similarly determined for 2 to 8. Table 1 shows the relative sensitivity when the sensitivity of sample No. 1 is 100. (The same applies to Example 2 and thereafter.) However, Sample No. 1 was subjected to normal exposure using a fluorescent intensifying screen on both sides because of the same emulsion constitution layer as a normal double-sided X-ray film.

In the table, gamma is represented by the reciprocal of the logarithm of the reciprocal of the X-ray dose giving a concentration of 1.0 and 2.0.

The following evaluation was performed on the sample after coating and drying.

As an evaluation of the image quality of each of Samples Nos. 1 to 8, sharpness is evaluated using a real sample.

Photographs were taken at a tube voltage of 90 KVP using the fluorescent intensifying screen KO-250 only on the high sensitivity emulsion layer side by the single back method. The processing was the same as that of the sensitometry (the same automatic developing machine, processing agent, processing temperature and processing time).

Sharpness is measured by Funk Test Chart SMS5853
(Konica Medical Co., Ltd.) and processed under the same tube voltage, intensifying screen and processing conditions as in the actual photography.

Each sample was exposed to light so that the average density of light and shade formed by the funk test chart was 0.8 ± 0.02.

Developer composition Developer solution Potassium sulfite 60.0 g Hydroquinone 25.0 g 1-Phenyl-3-pyrazolidone 1.5 g Boric acid 10.0 g Potassium hydroxide 23.0 g Triethylene glycol 17.5 g 5-Methylbenztriazole 0.04 g 5-Nitrobenzimidazole 0.11 g 1-phenyl-5-mercaptotetrazole 0.015 g glutaraldehyde bisulfite 8.0 g glacial acetic acid 16.0 g potassium bromide 4.0 g Add water to make 1 liter.

Fixing solution Sodium thiosulfate 45 g Disodium ethylenediaminetetraacetate 0.5 g Ammonium thiosulfate 150 g Anhydrous sodium sulfite 8 g Potassium acetate 16 g Aluminum sulfate 10 to 18 hydrate 27 g Sulfuric acid (50 wt%) 6 g Citric acid 1 g Boric acid 7 g Glacial acetic acid 5 g 1 L And the pH was adjusted to 4.0 (25 ° C.) with glacial acetic acid.

The developing solution and the fixing solution were used in an automatic developing machine 24 hours after the preparation.

Evaluation of sharpness A: Up to 10 LP / mm can be identified with a loupe.

B: Up to 8 LP / mm can be identified with a loupe.

C: Up to 6 LP / mm can be identified with a loupe.

D: Up to 5 LP / mm can be identified with a loupe.

E: Up to 4 LP / mm can be identified with a loupe.

A indicates that A is the best and E is not. The results obtained are shown in Table 2 below.

[0156] Incidentally, S _B in the table is the sensitivity of the B surface photosensitive layer. S _B ′ is the apparent sensitivity obtained from the image on the side B obtained by removing the photosensitive layer on the side A from the aforementioned document (I).

Therefore, S _B ′ / S _B is the difference between the amount of light that reaches the B surface after passing through the photosensitive layer of the A surface and the support when exposed from the A surface side, and the amount of light that enters the A surface. Corresponding to the ratio.

[0158]

[Table 1]

[0159]

[Table 2]

As shown in Table 2, the samples of the present invention No. 7 and No. 7
Samples 8, 9, and 10 exhibited high sensitivity even in single-sided photographing and were excellent in sharpness. No. 5 has a high sensitivity emulsion layer with fog density +
When the density was 1.60, the low-speed emulsion layer had a density of fog density + 0.20 or more, and the sharpness was not good.

Example 2 CRT was performed using the silver halide grains prepared in Example 1.
(Cathode Ray Tube) Medical imaging film for photography was prepared.

Table 3 shows the constitution of the emulsion used and the amount of the emulsion layer with gelatin.

The emulsion additive, protective film formulation, support used, and drying conditions were prepared under the same conditions as in Example 1. Further, the developing process was the same as in Example 1.

The following backing dyes were added to both the emulsion layer and the protective layer on the low sensitivity emulsion layer in the following amounts.

The sensitivity of the prepared samples No. 9 to No. 12 was determined by Konica Medical Imaging Camera MM (CRT phosphor No.
Using P.45), the gray scale was exposed at a shutter speed of 1 second to determine the relative sensitivity.

[0166]

Embedded image

The drying test was performed by using an automatic processor SR
The processing was performed in a 45-second processing mode using X-501 (manufactured by Konica Corporation). The temperature at the place where the automatic developing machine was installed was 25 ° C., and the relative humidity was 62%. Dry air temperature setting of automatic processor is 43
° C.

However, in the evaluation of the drying property, in order to confirm the practical drying property, a processing machine and a processing agent were used under the same conditions as in the above-described sensitivity measurement.

The dryness was evaluated in five steps according to the following criteria.

Drying Evaluation Criteria Completely dry, sample is warm A2. 2. Completely dry, sample is cold B Slightly wet (less than 1/3) C4. Wet (less than 2/3) D5. Wet (more than 2/3) E The above evaluation results are shown in Table 4. The evaluation of the drying properties was made under the same conditions as in the above-mentioned measurement of the water absorption because it was necessary to check the degree of drying on each sample side, but the evaluation results correlate with the case of processing in an automatic developing machine under ordinary conditions.

[0171]

[Table 3]

As shown in Table 4, the photosensitive material of the present invention was No. 1
Nos. 1 and 12 had high sensitivity, high sharpness, and good drying properties.

Further, when the residual silver and residual hypo of the developed sample were measured, it was clear that No. 11 of the present invention sample was smaller than No. 9 of the comparative sample, and No. 12 of the present invention sample was the comparative sample N.
Good storage stability can be expected with less than o.10.

Example 3 Using the silver halide emulsion prepared in Example 1, an emulsion was mixed and prepared as shown in Table 5, and a coating solution was prepared in exactly the same manner as in Example 1; The indicated film samples were prepared.

The obtained sample was subjected to 45
Processing was performed in the second mode.

FIG. 4 to FIG. 11 show the characteristic curves of the sample of this example. The characteristic curve of the high-sensitivity emulsion layer in the figure shows that the sample exposed from the high-sensitivity emulsion layer side was developed, Low sensitivity)
The emulsion layer was wiped off using a proteolytic enzyme, and an image of the high-sensitivity emulsion layer alone was measured.

The characteristic curve of the low-sensitivity emulsion layer was determined by developing a sample exposed from the high-sensitivity emulsion layer, wiping off the back (high-sensitivity) emulsion layer using a protease, and measuring the image of the low-sensitivity emulsion layer alone. .

The sensitivities in the table indicate the X required to obtain a density of 1.0.
It was calculated as the reciprocal of the dose and expressed as relative sensitivity when sample No. 1 was set to 100. However, Sample No. 1 was subjected to normal exposure using a fluorescent intensifying screen on both sides because of the same emulsion layer structure as a normal double-sided X-ray film.

The gamma in the table is represented by the reciprocal of the logarithm of the reciprocal of the X-ray dose giving (fog + 0.70) and (fog + 1.20).

As is clear from Table 6, the sample according to the present invention is excellent in sharpness without lowering the sensitivity, whereas the comparative example, for example, sample No. 8 has good sharpness but the sensitivity is significantly lowered. You can see that.

[0181]

[Table 4]

[0182]

[Table 5]

Example 4 Example 2 using the silver halide grains prepared in Example 1
Samples having the configuration shown in Table 7 were prepared in exactly the same manner as described above.

Table 8 shows the results of testing the obtained samples for sensitomery, sharpness and dryness.

As is clear from Table 8, the sensitivity, sharpness, and dryness were all good.

[0186]

[Table 6]

[0187]

[Table 7]

Example 5 (A) Preparation of Monodisperse Emulsion While maintaining the reaction vessel at 60 ° C., pAg = 8, and pH 2, the average particle diameter was 0.3 μm and the coefficient of variation was 0.14 in a cubic shape by the double jet method. To obtain a silver bromoiodide monodispersed cubic emulsion containing 2 mol% of silver iodide. According to observation with an electron microscope, the incidence of twins was 1% or less in number.

Using this emulsion as a seed crystal, the emulsion was further grown as follows.

The aqueous solution of gelatin was kept at 40 ° C. in the reaction vessel to dissolve the seed crystals, and then the pH was adjusted by adding aqueous ammonia and acetic acid.
Adjusted to 9.5.

After adjusting the pAg to 7.3 with an ammoniacal silver ion solution, while keeping the pH and pAg constant, a solution containing ammoniacal silver ions, potassium iodide and potassium bromide was added by a double jet method. A silver iodobromide emulsion containing 30 mol% of silver iodide was formed.

After adjusting the pH to 9 and the pAg to 9.0 using acetic acid and silver bromide, an ammoniacal silver ion solution and potassium bromide were added at the same time, and then grown to 90% of the grain size. At this time, the pH was gradually lowered from 9.0 to 8.20.

After adding potassium bromide solution to adjust pAg to 11,
Add ammoniacal silver ion solution and potassium bromide to add p
Grow while gradually lowering H to 8, average particle size 0.7μ
silver iodide 2 with a coefficient of variation of 0.15 in a cubic shape rounded at m
A monodisperse silver iodobromide emulsion containing mol% was obtained.

In preparing the emulsion, 300 mg of the sensitizing dye (A) and 15 mg of the sensitizing dye (B) were added per 1 mol of silver in the emulsion.

The obtained emulsion was kept at 40 ° C., and an appropriate amount of a formalin resin of sodium naphthalenesulfonate (average degree of polymerization: 4 to 6) was added thereto to precipitate silver halide grains, and the supernatant was discharged. Thereafter, after adding pure water at 40 ° C., magnesium sulfate was added, and silver halide grains were precipitated again, and the supernatant was removed.

After the above procedure was repeated, gelatin was added to obtain an emulsion having a pH of 6.0 and a pAg of 8.5.

The obtained emulsion was added with ammonium thiocyanate, chloroauric acid and hypo and subjected to chemical ripening under the condition to obtain the highest sensitivity.

Then, an appropriate amount of 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene was added as a stabilizer to obtain an emulsion. This emulsion was designated as (A-1).

In the same manner as in (A-1), only the particle size was 0.4 μm.
Was prepared as Emulsion (A-2).

(B) Preparation of Tabular Grain Emulsion 10.5 g of potassium bromide in 1 liter of water, 0.5 wt% aqueous solution of thioether compound HO (CH ₂ ) ₂ S (CH ₂ ) ₂ S (CH ₂ ) ₂ OH 10ml,
And 30 g of gelatin were added and dissolved, and kept at 70 ° C. While stirring, 0.88 mol / l 30 of an aqueous silver nitrate solution is added to this solution.
ml, potassium iodide and potassium bromide (molar ratio 3.5: 96.
0.88 mol / l 30 ml of the aqueous solution 5) was added by a double jet method to obtain grains having an average grain size of 0.68 µm and a silver iodide content of 3.5 mol%.

After the completion of the addition of the mixed solution, the temperature was lowered to 40 ° C. To this, 24.6 g / AgX mol of sodium formalin resin of sodium naphthalene sulfonate and magnesium sulfate were added respectively, the pH was lowered to 4.0, and desalting was performed.After that, 15 g / AgX mol of gelatin was added, and tabular grains were added. An emulsion was prepared.

The emulsion obtained in the above (B) was subjected to chemical sensitization. That is, ammonium thiocyanate, chloroauric acid and hypo were added, and gold-sulfur sensitization was performed.

After completion of the chemical sensitization, 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene was added. Thereafter, 150 mg of potassium iodide / 1 mol of AgX, the sensitizing dye (A),
(B) was added in the same amount as in emulsion (A-1), and spectral sensitization was performed. The emulsions thus obtained are each referred to as emulsion (B).

The additives used in each of the emulsion solutions (A-1), (A-2) and (B) (photosensitive silver halide coating solutions) are as follows. Silver halide 1
Shown in the amount per mole.

T-butyl-catechol 400 mg polyvinylpyrrolidone (molecular weight 10,000) 1.0 g styrene-maleic anhydride copolymer 2.5 g nitrophenyl-triphenylphosphonium chloride 50 mg 1,3-dihydroxybenzene-4-ammonium 4-sulfonate 4 g 2- Sodium mercaptobenzimidazole-5-sulfonate 1.5 mg C ₄ H ₉ OCH ₂ CH (OH) CH ₂ N (CH ₂ COOH) ₂ 1.0 g

[0206]

Embedded image

Additives used in the protective layer solution are as follows. The amount of addition is shown in an amount per 1 g of gelatin.

Silicon dioxide particles Matt agent composed of polymethyl methacrylate having an area average particle size of 7 μm 7 mg Colloidal silica (average particle size 0.013 μm) 70 mg 2,4-Dichloro-6-hydroxy-1,3,5-triazine sodium salt 30 mg Sodium-i-amyl-n-decylsulfosuccinate 7 mg F ₁₉ C ₉ O (CH ₂ CH ₂ O) ₁₀ CH ₂ CH ₂ OH 3 mg

[0209]

Embedded image

The above coating solution was applied to both sides of a 180 μm-thick undercoated blue-colored polyethylene terephthalate film base and dried to prepare Sample Nos. 1 to 11 as shown in Table 9. did.

As shown in Table 9, the compounds of the polyhydric alcohol according to the present invention were added to the emulsion coating solution. The coating amounts were adjusted so that the amounts of gelatin and silver were as shown in Table 9.

Emulsion (A-1) was used for (A side) of Sample Nos. 1 to 9, and Emulsion (B) was used for (A side) of Samples Nos. 10 and 11. Emulsion (A-2) was used for all B side.

The relative sensitivity of each side of the obtained sample was obtained in the same manner as in Example 1.

Evaluation of MTF A sample was placed in close contact with an MTF chart containing a square wave of 0.5 to 10 lines / mm made of lead on the front side of a fluorescent screen, and a portion of the film surface not covered by the lead chart was measured. X-rays were irradiated so that the concentration was about 1.0 on both sides.

After subjecting the sample irradiated with X-rays as described above to the same development processing as described above, the recorded rectangular wave pattern was measured using a Sakura Micro Densitometer Model M-5 (manufactured by Konica Corporation). It measured using. At this time, the aperture size was 300 μm in the parallel direction of the rectangular wave and 25 μm in the perpendicular direction, and the magnification was 20 times. M obtained
It represents the TF value and is represented by a value of a spatial frequency of 2.0 lines / mm.

The sharpness in the table was evaluated by observing the limb bone phantom obliquely at an X-ray incident angle of 30 °, performing the same processing as described above, and visually observing the obtained image on the following five levels. .

[0217] 1. Very poor 2. Inferior Normal 4. Good 5. Very good Evaluation of curl degree Temperature of three identical film samples and wrapping paper (natural pulp paper)
The sample was placed in an atmosphere of 23 ° C. and 50% RH for 10 hours, adjusted for humidity, three samples were stacked, sandwiched with wrapping paper, and a load of ² g / cm ² was applied.
Left for hours.

The evaluation of the curl degree of the obtained sample was performed in the following five stages.

A: -0.50 to +0.50 B: -1.00 to -0.51 and +0.51 to +1.00 C: -1.50 to -1.01 and +1.01 to +1.50 D: -2.50 to -1.51 and +1 .51 to +2.50 E: -2.51 or less and +2.51 or more A means that the curl is the least and is excellent.

Evaluation of Kutzuki Films were superposed on each other, sealed and packaged under the same conditions, and a load was applied to the film so that a pressure of 20 g / cm ² was applied.
After standing at 3 ° C. for 3 days, the degree of tightness between the films was evaluated in five steps as follows.

A: No adhesion at all B: 5% or less of the entire area adhered C: 10% or less of the entire area adhered D: 30% or less of the entire area adhered E: 31% or more of the entire area adhered Automatic conveyance Evaluation of Properties After storing a sample of 100 pieces of normal quarter-size film (divided by 50 pieces of sand paper) into a sample form and storing it at normal temperature and normal humidity for 5 days, KD Auto Feeder 500 (Konica Corporation) ) Was used to perform an automatic transfer test.

The evaluation was performed in the following four stages.

A: All 100 sheets were normally conveyed.

B: All 100 sheets were conveyed. (There was a trouble on the way, but it was automatically recovered.) C: 1-4 sheets out of 100 sheets were not transported. (No automatic recovery) D: 5 or more of 100 sheets are not transported.

The results obtained are shown in Table 9 below.

[0226]

[Table 8]

[0227]

[Table 9]

As can be seen from Table 9, the sample according to the present invention had a low curl degree, and there was no crack between the films, so that no trouble occurred in the automatic conveyance.

The obtained image had excellent sharpness and high sensitivity. Samples Nos. 4 and 5 were somewhat inferior in automatic transportability.

Example 6 Using the film of Sample No. 7 in Example 5, as shown in FIGS. 1 (a), 3 (b), (c) and (d) of the accompanying drawings, Was cut into a quarter-cut film (length: 25.4 cm × width: 30.5 cm) to obtain a single-sided direct X-ray film of the present invention. On the other hand, as the cassette for the film, the corresponding cassettes (a '),
(B '), (c') and (d ') were prepared. Using the four kinds of films and cassettes obtained in this way, the screen was loaded with an intensifying screen in a dark room, and then the tube voltage was set to 90 KVP.
After X-ray exposure through an aluminum wedge at a tube current of 100 mA, development was performed with an automatic developing machine SRX-501 using XD-SR and XF-SR processing solutions (both manufactured by Konica Corporation). In the four-section film (b), (c) and (d) of FIG. 3 according to the method of the present invention, the film loading in the dark room matches the corresponding film cassette as compared with (a). There was no need to distinguish the front and back of the film, and there was no easy and erroneous loading.

[0231]

According to the present invention, a silver halide photographic material having high sensitivity, high sharpness, and improved automatic film transportability is obtained.

Further, according to the present invention, a silver halide photographic light-sensitive material capable of obtaining a high-sharpness image by performing single-sided exposure using a fluorescent intensifying screen on only one side, and a method for photographing the same were obtained. Further, according to the present invention, when the film is inserted into the cassette, the front and back of the film can be easily determined, and the film can be loaded without misloading.
A radiographic method could be provided.

[Brief description of the drawings]

[1] to display the plan view of Yotsugiri film (a) and the film cassette (b) for comparison which is used conventionally in general.

FIG. 2 is a side view of a film cassette (b).

FIG. 3 shows three examples of a plan view of a quarter-cut film and a film cassette according to the present invention. In the drawing, Ι represents a notch of the film, and Ι ′ represents a film matching portion of a cassette having substantially the same irregularities as Ι corresponding to each film. II represents the cassette number.

FIG. 4 is a characteristic curve of the silver halide photographic light-sensitive material obtained in Example 3 of the present invention.

FIG. 5 Silver halide photograph obtained in Example 3 of the present invention
6 is a characteristic curve of a photosensitive material.

FIG. 6 Silver halide photograph obtained in Example 3 of the present invention
6 is a characteristic curve of a photosensitive material.

FIG. 7 Silver halide photograph obtained in Example 3 of the present invention
6 is a characteristic curve of a photosensitive material.

FIG. 8 Silver halide photograph obtained in Example 3 of the present invention
6 is a characteristic curve of a photosensitive material.

FIG. 9 Silver halide photograph obtained in Example 3 of the present invention
6 is a characteristic curve of a photosensitive material.

FIG. 10 Silver halide copy obtained in Example 3 of the present invention
It is a characteristic curve of a true photosensitive material.

FIG. 11 Silver halide copy obtained in Example 3 of the present invention
It is a characteristic curve of a true photosensitive material.

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G03C 3/00 572 G03C 3/00 572Z 5/17 5/17 (56) References JP-A-2-266344 (JP, A) JP-A Heisei 2-110538 (JP, A) JP-A-3-155546 (JP, A) JP-A-4-181238 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03C 1/46 G03C 5/17

Claims (14)

(57) [Claims] 1. A photosensitive material for single-sided exposure having at least one silver halide emulsion layer on both sides of a transparent support, and after exposing and developing the photosensitive material, the exposure amount is fogged on one side. A single-sided exposure silver halide photographic light-sensitive material, wherein the density at the corresponding same exposure position on the other surface is fog density +0.20 or less when the exposure amount gives a density of 1.60. material. 2. The piece according to claim 1, wherein the surface on the side where the concentration is increased is a high sensitivity surface.
Silver halide photographic material for surface exposure . 3. The one-side exposure according to claim 2, wherein the sensitivity of the high-sensitivity surface is 1.5 to 10 times the sensitivity of the other low-sensitivity surface . Silver halide photographic material. 4. The one-side exposure according to claim 2, wherein the amount of silver on the high sensitivity surface is 1.1 to 5.0 times the amount of silver on the low sensitivity surface . Silver halide photographic material. 5. The method according to claim 2, wherein 50% or more of the projected area of all silver halide grains on said high sensitivity surface has a grain size of 0.50 μm or more and 2.00 μm or less. The silver halide photographic material for single-sided exposure according to the above item. 6. A twin tabular grain having a normal crystal monodispersion and / or an aspect ratio of 5 or more in at least 60% of the projected area of all silver halide grains on the high sensitivity surface. The silver halide photographic material for single-sided exposure according to item (2). 7. A silver halide photographic material for single-sided exposure having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides, wherein a latent image is formed from the high sensitivity side of the photographic material. An image forming method, comprising exposing to light having a wavelength of 300 nm or more capable of forming and developing. 8. A silver halide photographic material for single-sided exposure having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides, wherein a latent image is formed from the high sensitivity side of the photographic material. Exposure with light having a wavelength of 300 nm or more capable of forming,
The amount of transmitted light that passes through the support from the high-sensitivity surface and reaches the interface between the support and the low-sensitivity emulsion layer is 12% or more and 75% or less of the exposure amount on the high-sensitivity surface in a method of forming an image by developing. The silver halide photographic material for single-sided exposure according to claim 2, wherein: 9. A silver halide photographic material for single-sided exposure having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides, wherein a latent image is formed from the high sensitivity side of the photographic material. When exposed to light having a wavelength of 300 nm or more capable of forming, the amount of transmitted light that passes through the support from the high-sensitivity surface and reaches the interface between the support and the low-sensitivity emulsion layer is less than the amount of exposure to the surface of the high-sensitivity surface. When the exposure amount is 12% or more and 75% or less and gives a density of fog density +1.60 to the highly sensitive surface after the development processing, the density at the corresponding same exposure position on the other surface is fog +0. The silver halide photographic light-sensitive material for single-sided exposure according to claim 2, wherein the photographic material has a molecular weight of 20 or less. 10. A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support and having different sensitivities on both sides for single-sided exposure . Exposure to light with a wavelength of 300 nm or more capable of forming a latent image from the surface,
The amount of transmitted light that passes through the support from the high-sensitivity surface and reaches the interface between the support and the low-sensitivity emulsion layer is 12% to 75% of the exposure amount on the high-sensitivity surface in a method of forming an image by developing. The silver halide photographic light-sensitive material for single-sided exposure according to claim 2, characterized in that: 11. An exposure method in which light having a wavelength of 300 nm or more capable of forming a latent image is exposed from a high-sensitivity surface by fluorescence emitted by absorption of X-rays. And the amount of transmitted light reaching the interface between the support and the low-sensitivity emulsion layer is 12% of the amount of exposure on the high-sensitivity surface.
The method for forming an image on a silver halide photographic material for one-sided exposure according to claim 2, wherein the content is at least 75%. 12. A silver halide photographic light-sensitive material having a silver halide emulsion layer on both sides of a transparent support, and having different sensitivities on both sides, for single-sided exposure . An image forming method, comprising exposing only light having a wavelength of 300 nm or more capable of forming a latent image from the surface from the high sensitivity surface side. 13. A silver halide photographic material for single-sided exposure having a silver halide emulsion layer on both sides of a transparent support and different sensitivities on both sides, wherein the sensitivity on the high-sensitivity side is low. _GH (Ag / gelatin), which is the weight ratio of silver to gelatin on the high-sensitivity surface, is 1.5 to 10 times higher than the sensitivity of the high-sensitivity surface. G _L (Ag
/ Gelatin) value and the polyhydric alcohol compound content per g of gelatin is from 5.0 × 10 ⁻⁵ to 5.0 × 10 ^−3.
A silver halide photographic light-sensitive material for single-sided exposure , characterized by containing 0.1 mol. 14. A film and a cassette , comprising :
Has a notch in the form of irregularities at a certain position at the end of
The cassette has an uneven shape at the end of the film.
Imaging method using substantial claims, characterized in that it has a matching shape the (3) The silver halide photographic light-sensitive material for one surface exposure according to claim with.