JPH04123050A - Silver halide photographic sensitive material and processing method for this material - Google Patents

Abstract

PURPOSE:To obtain the silver halide photographic sensitive material for X-rays having a high sensitivity and excellent sharpness by giving a sensitivity difference to the photosensitive emulsions on both surfaces of a base. CONSTITUTION:This silver halide photographic sensitive material is coated with silver halide emulsion layers on both surfaces of the base and the sensitivity of the emulsion surface on one side is set as high as 1.5 to 10 times the sensitivity of the emulsion surface on the other side. This sensitivity difference is measured basically by using the light source for photographing the photosensitive material to be used; for example, the difference is measured by using fluorescent sensitizing paper for photographing regular X-ray films in the case of the regular X-ray film and by using fluorescent sensitizing paper for photographing ortho-X-ray films in the case of the ortho-X-ray film. The silver halide photographic sensitive material for X-ray photographing which can form images having high sharpness with the high sensitivity when processed with a single-bath developing and fixing bath after exposing is obtd. in this way.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a silver halide photographic material that is processed with a monobath developer-fixer after exposure to produce a high-sensitivity, high-sharp image. This invention relates to photographic materials and processing methods thereof.

[Background of the invention]

X-ray imaging films used for medical diagnosis are generally used in combination with a fluorescent screen during imaging. This system uses an X-ray film with emulsion layers on both sides sandwiched between two intensifying screens and held in a cassette. This takes into consideration the influence of X-rays on the human body, and in order to effectively utilize X-rays, the X-rays that have passed through the front intensifying screen are further used in the rear intensifying screen.

However, while films and intensifying screens in recent years have become more sensitive, there is a strong demand for higher image quality, and in particular, improved sharpness is strongly desired in order to understand the condition of lesions or affected areas in more detail.

In conventional double-sided systems, there are photosensitive emulsion layers on both sides, so light transmission to the back side (so-called
There was a problem in that this caused a blurred image on the back surface and deteriorated sharpness.

Furthermore, in order to achieve high sharpness, attempts have been made to provide an emulsion layer only on one side and expose it only from one side. However, when an emulsion layer is provided on only one side and one side is exposed, in order to obtain the same performance as on both sides, it is necessary to coat the same amount of silver halide on one side as on both sides.

As a result, developability and fixing properties are deteriorated, and images are disadvantageously deteriorated due to residual silver and residual hypo.

Therefore, it has been desired to develop a new technology that provides high sensitivity and high image quality without sacrificing rapid processing performance.

[Purpose of the invention]

Accordingly, a first object of the present invention is to provide a silver halide photographic material for X-rays which has high sensitivity and excellent sharpness.

A second object of the present invention is to process a silver halide photographic light-sensitive material in which an image can be obtained without deteriorating rapid processability by one-bath development of a light-sensitive material in which a silver halide emulsion layer is coated on both sides of a support. The purpose is to provide a method. Other objectives will become apparent from the description below.

[Structure of the invention]

As a result of intensive studies, the present inventors have found that these objects can be achieved by the following method, and have completed the present invention.

That is, in a silver halide photographic material having at least one light-sensitive silver halide emulsion layer on both sides of a transparent support, the sensitivity of the emulsion surface on one side is the same as the sensitivity of the emulsion surface on the other side. This is achieved by a silver halide photographic material and a processing method thereof, in which a silver halide photographic material having a sensitivity 1.5 to 10 times higher than that of a silver halide photographic material is processed with a single-bath developer-fixing solution.

The present invention will be explained in detail below.

Traditionally, in films with emulsion layers on both sides of the support,
In the case of image observation, we are looking at the sum of the front image that is directly visible to the eye and the back image that has passed through the support base and is visible to the eye. When this image is viewed at right angles to the support, there is no problem, but when viewed at an angle, the images on the front and back sides become "shifted" and the sharpness naturally decreases.

Additionally, when taking X-rays, it is common to take X-rays so that the angle of incidence is 90'' with respect to the film surface, but in some cases, the X-rays are taken at an oblique angle, and in such cases, both front and back sides are taken. The "shift" in the image is further magnified, resulting in a significant decrease in sharpness.

In conventional systems, the sum of images on both sides was observed in this way, but after various studies, the inventors of the present invention determined that by shifting the image to one side depending on the density area, it is possible to improve the image quality from low to medium density areas. It has been found that the sharpness of images in the density range can be significantly improved.

Note that when an emulsion layer is provided on only one side, sharpness does not deteriorate, but the development processability deteriorates significantly because the same amount of silver halide emulsion is coated because it is necessary to obtain the same performance as when using both sides. However, problems such as decreased sensitivity, residual color, and deterioration of stored images due to residual silver and residual hypo are caused.

In the present invention, emulsion layers are coated on both sides of a support, and unlike conventional methods, the present invention is characterized in that a sensitivity difference is created between the photosensitive emulsions on both sides. Moreover, when photographing, exposure is done from only one side.

The sensitivity difference referred to in the present invention is basically determined using the light source for photographing the photosensitive material used in the present invention.

For example, a regular X-ray film is measured using a fluorescent intensifying screen for regular X-ray film photography, and an ortho X-ray film is measured using a fluorescent intensifying screen for ortho X-ray film photography.

In addition, if a system that utilizes a powerful light source (panchromatic, infrared, etc.) appears in the future, it will be possible to measure using a light source that is used in combination with a photosensitive material.

The difference in sensitivity between the high-sensitivity emulsion layer and the low-sensitivity emulsion layer of the present invention is determined by the maximum density (not including the support density) on each side of the light-sensitive material.
It can be determined as the ratio of the reciprocal of the amount of light required to obtain a density of 0%.

Sensitive materials for laser imagers have wavelengths of 820 nm, 780 nm, etc.
For e-Ne, it can be applied to sensitivity using a 633 nm light source or indirect X-ray film.

In cases where the density of information from the photograph is concentrated below 2.0, such as in medical black-and-white photographs, it is difficult to depict the low-density area on the side facing the light source. This is very effective as a means of preventing deterioration in sharpness of photographs during observation.

Similar to the present invention, there is a single-sided emulsion film for single-sided exposure systems for the purpose of improving sharpness. However, in order to obtain high sensitivity with this film, the desired sensitivity and maximum density cannot be obtained unless a large amount of silver halide with a large grain size is coated.

As mentioned above, when a large amount of silver halide layer is provided on one side of the support, processing properties such as development, fixing, washing and drying deteriorate, and photographic constituent layers are becoming thinner for rapid processing. This goes against reality and is not desirable.

For the total amount of silver halide on the side constituting the high-sensitivity side of the light-sensitive material of the present invention, it is necessary to use silver halide grains with a larger average grain size than on the low-sensitivity side, and to form a density as high as possible. Therefore, it is necessary to increase the amount of silver halide on the high-sensitivity side.

In order to achieve the object of the present invention, the total amount of silver halide on the side constituting the high-speed surface is 1.1 times or more, preferably 1.2 times or more, as compared to that on the low-speed surface. is preferred. The silver content ratio of both layers is preferably 1:5 or less. If it exceeds this range, the advantage of providing silver halide on both sides of a photosensitive material intended for single-sided exposure, as in the present invention, will be diminished.

The present invention can be applied to conventional single-sided emulsion photosensitive materials for use in CRT photography, laser printer or laser imager photography, mammography, and the like.

A further feature of the present invention is that the light-sensitive material according to the present invention is exposed only from one side. In this case, the film may be placed on either the front or the back side with respect to the X-ray incident side, but preferably the surface of the high-sensitivity layer is on the incident side.

When using a fluorescent intensifying screen, it may be set on either the front or back side of the film, but it is preferable to set the fluorescent intensifying screen on the high-sensitivity emulsion layer side to better achieve the objective effects of the present invention.

As mentioned above, the silver halide photographic light-sensitive material according to the present invention has a silver halide emulsion layer coated on both sides of the support, and is characterized in that the sensitivity of the emulsion differs between the front and back sides.

On the other hand, processing of silver halide photographic materials is becoming faster and simpler, and there is a demand for silver halide photographic materials having suitability for rapid development processing.

Conventionally, as a processing method that simplifies the development process, a one-bath development and fixing method has been known in which development and fixing are performed in the same process, and moreover, a small amount of processing solution is used.

In the one-bath development method, the photosensitive material after exposure is fixed while the development is completed prior to this, so images with high sensitivity, high density, and high gamma are particularly
In particular, this tendency becomes more pronounced as the amount of silver coated on the photosensitive material increases.

As a result of subjecting the above-mentioned double-sided coated silver halide photographic light-sensitive material according to the present invention to a one-bath development and fixing process in which development and fixing proceed simultaneously, an image with high sensitivity and high sharpness comparable to that of conventional processing can be obtained. I was able to get it.

The one-bath developing/fixing solution according to the present invention may have a conventionally known composition, such as those described in Japanese Patent Publication No. 10301/1982 and Japanese Patent Application Laid-Open No. 53439/1989. It may be.

The one-bath developing/fixing solution of the present invention includes dihydroxybenzenes such as hydroquinone used in ordinary black and white developing solutions,
Developing agents such as 3-pyrazolidones such as l-7enyl-3-pyrazolidone or aminophenols such as monomethyl-p-amino/phenol sulfate are used, and these developing agents may be used alone or in appropriate combinations. May be used.

When hydroquinone and other developing agents are used together, the molar ratio of hydroquinone and other developing agents is arbitrary, but is preferably about 1:o, ol-'1.

Typical fixing agents used in the one-bath developing/fixing solution of the present invention include thiosulfates such as sodium thiosulfate and ammonium thiosulfate, cyanides such as potassium cyanide and sodium cyanide, and thiocyanides such as sodium thiocyanide and ammonium thiocyanide. chloride, ammonium chloride,
Examples include thiourea and thiocinamine, and these fixing agents may be used alone or in appropriate combinations. Furthermore, various components used in ordinary one-bath developing and fixing solutions, such as sodium hydroxide, potassium hydroxide, sodium carbonate,
Alkaline agents such as sodium bicarbonate, alkali metal sulfites such as sodium sulfite, alkali metal bisulfites, alkali metal thiocyanates, alkali metal halides such as potassium bromide and potassium iodide, water softeners, thickening agents , solubilizers, organic development inhibitors such as penztriazole, 5-nitropenzimidazole, and mercaptotetrazole, development accelerators, hardeners such as potassium alum, chromium alum, glutaraldehyde, formaldehyde, halogenated aliphatics, and vinyl sulfones. A film agent, a stabilizer, a fixing aid, a fixing accelerator, etc. can be added as necessary.

The emulsion used in the silver halide photographic light-sensitive material of the present invention may be any silver halide such as silver iodobromide, silver iodochloride, silver iodochlorobromide, etc., but it is said that particularly high sensitivity can be obtained. From this point of view, silver iodobromide is preferred.

Silver halide grains in photographic emulsions are cubic, octahedral, 1
Whether it is a completely isotropic crystal like a tetrahedron, a polyhedral crystal like a sphere, a twin crystal with planar defects, or a mixed or composite type of these. good. The grain size of these silver halide grains is 0.177
The particles may be fine particles with a diameter of less than m to large particles with a diameter of 20 μm.

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

The emulsion of the silver halide photographic light-sensitive material according to the present invention is described, for example, in "Tbe theory" by T. H. James.
f thephotographic process
"4th edition, published by Macmillan (1977) 3
The method described on pages 8 to 104, G, F, Dauf fi
“Photographic Emulsion Chemistry” by n.
emulsionchemistry, Foca
Published by l press (1966), Glafki, P.
“Physics and Chemistry of Photography” by Des
ysique photoOgraphique” Pa
Published by ul Monte1 (1967), V, L, Z
“Manufacturing and Coating of Photographic Emulsions” by Elikman et al.
king and coating photogra
It is prepared by the method described in "Phicemulsion" Focal Press (1964).

That is, solution conditions such as neutral method, acidic method, ammonia method, etc.
It can be produced using mixing conditions such as forward mixing method, back mixing method, double jet method, Chondral double jet method, etc., particle preparation conditions such as conversion method, core/shell method, and combination methods thereof.

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

Examples of silver halide emulsions preferably used in the present invention include JP-A-59-177535 and JP-A-61-802.
No. 237, No. 61-132943, No. 63-4975
1 and Japanese Patent Application No. 63-238225. The convex walls of the crystal are cubic, tetradecahedral, octahedral, and the intermediate (1, 1,
l) plane and (1,0,0) plane may be arbitrarily mixed.

A monodisperse emulsion as used herein means that when the average particle diameter is measured by a conventional method, at least 95% of the particles in terms of number or weight are within ±40% of the average particle diameter, preferably within ±30%. It is a certain silver halide grain. The grain size distribution of silver halide may be either a monodisperse emulsion with a narrow distribution or a polydisperse emulsion with a wide distribution.

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

The emulsion according to a preferred embodiment of the present invention is a core/shell type monodispersed emulsion having a clear two-layer structure consisting of a high iodine core portion and a low iodine shell layer.

The silver iodide content of the high-magnification part is 20 to 40 mol%, particularly preferably 20 to 30 mol%.

Methods for producing such monodispersed emulsions are known, for example, J. Ph.
ot, Sic, pp. 12.242-251 (1963)
, JP-A-48-36890, JP-A-52-16364,
No. 55-142329, No. 58-49938, British Patent No. 1.413.748, US Patent No. 3,574.62
It is described in publications such as No. 8 and No. 3,655.394.

As the above-mentioned monodisperse emulsion, an emulsion in which grains are grown by using seed crystals and supplying silver ions and halide ions using the seed crystals as growth nuclei is particularly preferred. In addition,
Methods for obtaining core/shell emulsions are described in detail in publications such as British Patent No. 1,027,146, U.S. Patent No. 3,505.068, U.S. Pat. It is being

The silver halide emulsion used in the present invention may be tabular grains having an aspect ratio of 4 or more and less than 30.

The advantages of such tabular grains include improved spectral sensitization efficiency, improved graininess and sharpness of images, etc., as described in British Patent No. 2,112.157 and US Patent No. 4,4.
No. 39,520, No. 4,433.048, No. 4.41
No. 4,310, No. 4,434.226, Japanese Unexamined Patent Publication No. 1983-
No. 113927, No. 58-127921, No. 63-1
No. 38342, No. 63-284272, No. 63-30
It can be prepared by the method described in publications such as No. 5343.

The emulsion mentioned above may be a surface latent image type that forms a latent image on the grain surface, an internal latent image type that forms a latent image inside the grain, or a type that forms a latent image on the surface and inside. good. In these emulsions, cadmium salts, lead salts, zinc salts, thallium salts, iridium salts or complex salts thereof, rhodium salts or complex salts thereof, iron salts or complex salts thereof, etc. may be used in the stage of physical ripening or grain preparation. The emulsion may be subjected to a water washing method such as a Nordel water washing method or a 70 mL precipitation method to remove soluble salts. Preferred water washing methods include, for example, a method using an aromatic hydrocarbon aldehyde resin containing a sulfo group as described in Japanese Patent Publication No. 35-16086, or aggregating polymer agent example G 3 described in Japanese Patent Publication No. 63-158644. A particularly preferred desalting method includes a method using G 8 or the like.

Various photographic additives can be used in the emulsion according to the present invention in the steps before and after physical ripening or chemical ripening. Known additives include, for example, Research Disclosure No. 17643 (December 1978).
and the compounds described in the same No. 18716 (November 1979). Compound types and additives shown in these two research disclosures
Additives RD-17643 page Classification Chemical sensitizers 23 III Sensitizing dyes 23 rV development accelerators 2Q III Antifoggants 24 VI Stabilizers // 11 Color stain inhibitors 25 ■ Image stabilizers 25 ■ Ultraviolet absorbers 25 ~26 ■ Filter dye 〃 〃 Brightening agent 24 V hardness
Curing agent 26 X coating aid
Agent 26-27) I Surfactant 26-2
7 m plasticizer 27 ff
Anti-static agent 27
11 Matte agent 28
IVI binder
26 ffRD-18716 Page Classification 648 - Upper right 648 Right - 649 Left 648 - Upper right 649 - Lower right 650 Left - Right 649 Right - 650 Left 651 Left 650 Right 650 Right 650 Right 651 Left Use in photosensitive materials according to the present invention Examples of supports that can be used include the above-mentioned page 28 of RD-17643 and RD
-18716, page 647, left column.

Suitable supports include plastic films, and the surfaces of these supports may generally be provided with a subbing layer or subjected to corona discharge, ultraviolet irradiation, etc. in order to improve the adhesion of the coating layer. The emulsion according to the present invention can then be coated on both sides of the support thus treated.

When applying the present invention to medical X-ray radiography,
For example, a fluorescent intensifying screen whose main component is a phosphor that generates near-ultraviolet light or visible light when exposed to penetrating radiation is used. It is desirable to expose this material in close contact with both surfaces of a light-sensitive material prepared by coating both surfaces with the emulsion of the present invention.

The penetrating radiation herein refers to high-energy electromagnetic waves, and means X-rays and gamma rays.

Further, the fluorescent intensifying screen refers to, for example, an intensifying screen having a fluorescent component mainly composed of calcium tungstate, or a fluorescent intensifying screen having a rare earth compound activated with terviram as a main component.

〔Example〕

Examples of the present invention will be described below. However, it goes without saying that the present invention is not limited to the examples described below.

Example 1 (1) Preparation of monodisperse grains Monodisperse grains of silver iodobromide containing 2.0 mol% of silver iodide with an average grain size of 0.2 μm are used as cores, and iodine containing 30 mol% of silver iodide is used as the nucleus. Silver bromide was grown at pH 9.8, pA g7.8,
After that, equal moles of potassium bromide and silver nitrate were added at pH 8.2, pA g 9.1, and the average silver iodide content was 2.2 mol%.
The average grain size is 0.375 μm (
(1)1), 0.64. um((1)-2), 0.
88pm ((1)-3), 1.22μm ((1)-
Four types of monodisperse emulsion grains described in 4) were prepared.

The emulsion was desalted to remove excess salts using a conventional flocculation method.

That is, the emulsion was maintained at 40° C., and a formalin condensate of sodium naphthalene sulfonate and an aqueous sulfuric acid/magnesium solution were added to cause flocculation, and the supernatant liquid was removed.

The four types of particle sizes obtained had good dispersibility with S/upper<0.16.

(2) Preparation of tabular grains 5.5Q of a 1.5% gelatin solution containing 0.17 mol of potassium bromide, 80'C, pH 5,77 = 8, was stirred, and odor was removed by the double jet method. The equivalent of 2.1 moles of potassium chloride and 2.0 moles of silver nitrate were added in solution over a period of 3 minutes. pBr was maintained 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 was added for 4.6 minutes. (Consuming 8.6% of all silver nitrate used.)
Then, potassium bromide solution and silver nitrate solution were added at the same time to 12
Added for 1 minute. During this time, pBr was maintained at 1.15, and the addition flow rate was increased so that the flow rate at the end of addition was 2.3 times that at the start. (43.6% of the total silver nitrate used was consumed.) The potassium bromide solution addition was stopped and the silver nitrate solution was added for 1 minute. (Consuming 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 with the silver nitrate solution over a period of 12.0 minutes. During this time, the pBr was maintained at 1.7 and the flow rate was accelerated to be 1.5 times the starting rate upon completion. (35.9% of the total silver nitrate used was consumed.) To this emulsion was added 1.5 g of sodium thiocyanate, 1 mole of Ag, and held for 25 minutes. A solution of 0.60 mol of potassium iodide and silver nitrate were added by double jet method at equal flow rates for about 5 minutes until 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 moles.

In this way, an emulsion (
2) was prepared.

In these grains, tabular grains accounted for 80% or more of the total projected area of the silver iodobromide grains.

Sample preparation, processing and evaluation Obtained (1)-1, (1)2 and (1)-3, (1)
-4, (2) Each of the silver halide grains was added with pure water so that the volume per mole of silver was 500 m12, and then heated to 55°C, and the spectral sensitizing dyes A and B listed below were mixed at a ratio of 200:1.
-1 is 820mg, (112 is 600mg, (1
)-3 was added in an amount of 500 mg, (1)-4 was added in an amount of 360 mg, and the tabular grain (2) was added in an amount of 600 mg.

Added.

After 10 minutes, ammonium thiocyanate salt was added to 4X 10-3 mol of (1)-1 and 2X 1 mol of (1)2 per mol silver.
0-” mol, (1)3 is IX 10-3 mol, (1)-
4 is 1.6X 10-3 mole, (2) is 3X 10-"
In addition, appropriate amounts of chloroauric acid and hypo were added to start chemical ripening.

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

15 minutes before the end of chemical ripening (70 minutes after the start of chemical ripening), 200 mg of potassium iodide was added per mole of silver, and after 5 minutes, 10% (it/vol) acetic acid was added to adjust the pH to 5.6. The pH was lowered to
H back to 6.15 then 4-hydroxy-6-methyl-1,3,3a.

7-Chitrazaindene was added to complete the chemical ripening.

(1)-1, (1)-2, (1)-3 of the obtained particles,
(1)-4 and (2) are mixed as shown in Table 1, and then the emulsion shown below is prepared.The pH after preparing the photographic emulsion coating solution is 6.40, and the silver potential is 74 mV (35°C). was prepared using sodium carbonate and potassium bromide solution.

Using this emulsion coating solution, the amount of gelatin was adjusted to 2.0 g/m2 on both the high-sensitivity emulsion layer side and the low-sensitivity emulsion layer side.
A protective layer solution was prepared using the additives listed below so that the amount of silver halide grains was as shown in Table 1 in terms of silver, and the protective layer was coated with gelatin at an amount of 1.15 g/m2. 80% per minute using two slide hopper type coaters.
Simultaneously coat both sides on the support at a speed of 2 minutes.
It was dried in 0 seconds to obtain a sample. As a support, glycidimethacrylate 50wt%, methyl acrylate lQw
For 175 μm X-ray film, an aqueous copolymer dispersion obtained by diluting a copolymer consisting of three monomers, t% and butyl methacrylate 4Qwt%, to a concentration of 19wt% was coated as an undercoat liquid. A blue-colored polyethylene terephthalate film base was used.

The spectral sensitizing dyes used for sample preparation are as follows.

Spectral sensitizing dye A (CH2)ssO3Na (CH2)3503e Spectral sensitizing dye B Additives used in the emulsion solution (photosensitive silver halide coating solution) are as follows. The amount added is expressed per mole of silver halogenide.

1.1-dimethylol-1-bromo-l-nitromethane 70□8L-butyl-catechol polyvinylpyrrolidone (molecular weight 10.000) styrene-maleic anhydride copolymer nitrophenyl-triphenylphosphonium chloride 1.3-hydroxybenzene- 4 Ammonium sulfonate 2-mercaptobenzimidazole Sodium 5-sulfonate 00 mg 1.0 g 2.5 g 0 mg g 1.5 mg H 1-7 enyl-5-mercaptotetrazole 15 mg
The additives used in the protective layer solution are as follows.

The amount added is expressed per 1Q of coating liquid.

Lime-treated inert gelatin 68g Acid-treated gelatin 2g Polymethyl methacrylate Matting agent Silicon dioxide particles with area average particle size 3.5 μm Matting agent Ludox AM (manufactured by DuPont) (Colloidal silica) 2.4 -Dichloro-6-hydroxy- 2% aqueous solution of 1,3,5-triazine sodium salt Glyoxal 40% aqueous solution Formalin 35% 1.1g 0.5g 0g 2m12 2.0mff 2.0m12 υ C1zHzsCONH(CHzCHzO)sH2,Og
The sensitivity of each side of the obtained sample was determined using a fluorescent intensifying screen KO-250.
(manufactured by Konica Corporation) using the single-back method using only the back side, two samples were prepared, one photographed from the high-sensitivity emulsion layer side and the other photographed from the low-sensitivity emulsion layer side.

The side of the cassette without the intensifying screen was painted black with high light absorption.

For imaging, X-rays were irradiated at a tube voltage of 90 KVP and 20 mA for 70.05 seconds, and a sensitometric curve was created using the distance method to determine the sensitivity and maximum density.

For development, processing was carried out at 25° C. for 30 seconds using the following one-bath developing and fixing solution, followed by washing with water for 5 minutes and drying.

[One-bath developer-fixer-1 composition] Sodium sulfite 60g Sodium thiosulfate (anhydrous) 60g Ammonium thiosulfate (anhydrous) 10g Thioglycolic acid 10g Hydroquinone 30g Phenidone
Ig Dimaison
5g Ethylenediaminetetraacetic acid disodium salt 8g Potassium bromide 5g5
- Nitroindazole 0.1 g 1-phenyl-5-mercaptotetrazole 0.1 g Sodium hydroxide 22 g Glutaraldehyde 5 g or more is refined to IQ with pure water.

The sensitivity in the table is calculated by subtracting the support concentration from the maximum concentration.
．． Multiply by 4 and add the support concentration to obtain the concentration as the reciprocal of the X-ray dose required, and sample No.
It is expressed as relative sensitivity when set to 00.

However, since Samples No. 1 and 1 had the same emulsion constituent layers as a normal double-sided X-ray film, they were normally exposed using a fluorescent intensifying screen on both sides.

In addition, the following evaluation was performed on the sample after coating and drying.

As an evaluation of the image quality of each sample No. 1 to 8, the sharpness is evaluated using a photographed sample.

Fluorescent intensifying screen KO only on the high-sensitivity emulsion layer side using single back method
-250 and a tube voltage of 90KVP. The treatment was the same as the sensitometry described above.

Sharpness Functist Chart S M S 5853 (
Konica Medical Co., Ltd.) was used. Processed using the same tube voltage, intensifying screen, and processing conditions as the actual photo.

Each sample was exposed to light such that the average density of shading determined by the Funkist chart was 0.8±0.02.

(Evaluation of sharpness) A: It is possible to identify up to 10LP/mm using Roubaix.

B: 〃 8 〃 〃 (: tt 5 // //D=
// 5 〃 〃 E: // 4 // // Indicates that A is the best in the above.

As is clear from Table 1, the samples according to the present invention have high sensitivity and excellent sharpness.

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

Table 2 shows the composition of the particles used and the amount of gelatin in the emulsion layer.
Shown below.

The emulsion additives, protective film formulation, support used, and drying conditions were the same as in Example 1. The development process was carried out in accordance with Example 1 using monobath developer fixer 2 described below.

However, the following backing dyes were added to both the emulsion layer on the low-speed emulsion layer side and the protective layer in the amounts shown below.

The prepared samples were numbered No. 9 to No. 14, and the relative sensitivities were determined by exposing the gray scale using a Konica Medical Imaging Camera M, M (CRT phosphor No. P, 45) at a shutter speed of 1 second.

Backing dye A Backing dye B Protective layer 16 mg/m'' Evaluation method for residual silver The prepared samples No. 9 to No. 14 were developed using the following monobath developer-fixer-2 without exposure. A sample for evaluation of residual silver was obtained.Evaluation of residual silver was performed by the following method.

Add one drop of a 2.6X 10-3woQ/Q aqueous solution of sodium sulfide as a residual silver evaluation solution onto the above film for residual silver evaluation, leave it for 3 minutes, wipe off the liquid thoroughly, and store at room temperature and humidity. It was left for 15 hours. Perform the above operations 5 times each on A and B sides.
I went point by point. (For single-sided films, only the emulsion side was tested).

Then, using a PDA-65 type densitometer (manufactured by Konica Corporation), measure the transmission density of blue light in the area where the residual silver evaluation solution was dropped and the area where it was not dropped, and the average of the differences was calculated as the residual silver concentration. It was used as a guideline. The larger this difference (number) is, the more
This indicates that the residual silver concentration in the film after processing is high.

Evaluation using automatic processor processing Samples No. 9 to No. 14 were developed using a Konica Corporation automatic processor KX-500 for 90 seconds dry to dry to evaluate sensitivity and residual silver. was evaluated. The developer used is XD manufactured by Konica Corporation.
-90 was used, and the same XF was used as the fixing solution.

The results obtained are shown in Table 2 below.

[One-bath developer-fixer-2 composition] Sodium sulfite 60g Sodium thiosulfate (anhydrous) 50g Ammonium thiosulfate (anhydrous) 10g Hydroquinone phenidone dimezone ethylenediaminetetraacetic acid disodium salt 5g g g 10g l-phenyl-5-mercaptotetrazole 0. 1g Sodium hydroxide 0g As is clear from the results in Table 2, the sample according to the present invention:
- Sensitivity almost equivalent to that of normal processing was obtained in bath development, and an image with less residual silver was obtained compared to the comparative sample.

〔Effect of the invention〕

According to the present invention, an image having high sensitivity and high sharpness can be obtained by a single-bath processing method in which development and fixing are performed simultaneously.

Further, the present invention was effective as a silver halide photographic material for X-rays.

Claims (1)

[Claims] In a silver halide photographic material having at least one light-sensitive silver halide emulsion layer on both sides of a transparent support, the sensitivity of the emulsion side on one side is higher than the sensitivity of the emulsion side on the other side. A silver halide photographic light-sensitive material and a processing method thereof, characterized in that a silver halide photographic light-sensitive material having a sensitivity 1.5 to 10 times higher is processed with a single-bath developer-fixing solution.