JPS60162245A - Negative type silver halide photosensitive material and radiation image forming method - Google Patents

Abstract

PURPOSE:To decrease crossover light and to obtain a negative type photosensitive material having improved sharpness of an image by incorporating flat plate- shaped silver halide particles having the particle diameter of >=5 times the thickness of the particles as photosensitive silver halide particles. CONSTITUTION:A radiation image is formed by combining a negative type silver halide photosensitive material contg. photosensitive silver halide particles contg. flat plate-shaped silver halide particles having the particle diameter of >=5 times the thickness of the particles, metallic salt particles having the surface treated with a hard solubility imparting agent to have hard solubility and having no photosensitivity as well as physical developing nuclei provided on a transparent base such as cellulose acetate, polyethylene terephthalate film or the like and sensitizing paper and exposing combined the material by radiations then processing said material with the processing liquid contg. at least one reducing agent and at least one material to dissolve metallic salt particles.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a negative-working silver halide photographic material and a radiation image forming method using the photographic material. The present invention relates to a negative-working silver halide photographic material and a radiation image forming method that improve the deterioration of image sharpness caused by crossover light.

(Prior art) Most of the radiation-sensitive materials used to form reflection line images generally require high sensitivity and high contrast, so those in which a light-sensitive silver halide emulsion is coated on both sides of the support are used. It is used.

One of the major factors that deteriorates the image sharpness of such light-sensitive materials is the so-called crossover phenomenon. This is a phenomenon that occurs when photosensitive materials are used.

That is, the light generated from one intensifying screen sensitizes the silver halide emulsion layer that is in direct contact with the intensifying screen, and at the same time, it also passes through the silver halide emulsion layer and its support, and then reaches the opposite side. This is a phenomenon in which the silver halide emulsion layer of the image is exposed to light, resulting in the formation of images with poor sharpness.

The cause of blurring due to such cross-over light is that light is refracted and reflected and diffused in the intensifying screen, silver halide emulsion layer, and support, resulting in spreading on the image forming surface.

Possible ways to remove this crossover light include coloring the support or using a reflective support, but this naturally results in a decrease in sensitivity or in the transmission image. The problem is that it is not possible to easily remove or reduce crossover light.

In recent years, efforts have been made to reduce silver in photosensitive materials for the purpose of saving resources and reducing costs. As the optical density decreases, the transmission density of the emulsion layer decreases, resulting in the above-mentioned increase in cross-over light, which leads to the deterioration of sharpness.

On the other hand, when a silver halide photosensitive material is developed, the silver halide turns into metallic silver by a reducing agent in a developer, and a visible image can be obtained. In such processing steps, photographic properties with relatively little change can be obtained when developing a small amount of light-sensitive material, but when processing a large amount of light-sensitive material, reduction increases as the amount of processing increases. On the other hand, the composition of the developer gradually changes (referred to as a fatigued developer) due to reasons such as the consumption of the developer and an increase in the amount of substances emitted from the photosensitive material into the developer. This often results in significant deterioration of photographic properties such as a decrease in opacity and an increase in capri.

Therefore, as described above, there has been a strong desire to develop photosensitive materials that can always provide stable photographic properties even when the composition of the developer changes.

Previously, the applicant of the present invention proposed a new method that enables a large reduction in loading amount, as disclosed in Japanese Patent Application Laid-open No. 54-48544 (1).
tm Photosensitive silver halide grains (2) Metal salt particles that are more easily soluble than the photosensitive silver halide grains and have substantially no photosensitivity on which a refractory agent is adsorbed (3) Physical development nuclei A negative-working silver silver photographic material containing the following has been disclosed.

The above-mentioned negative silver halide photographic material has high sensitivity, high contrast, and high maximum density despite its low silver content, so it is natural that it can be used as a radiation-sensitive material. It is available.

However, as mentioned above, the above-mentioned negative-tone photosensitive materials are no exception to the increase in cross-over light associated with silver saving, and in addition to having the disadvantage of low sharpness, they are easily affected by fatigued developers. It has the disadvantage of significant deterioration of photographic properties such as a decrease in sensitivity, gamma, and an increase in capri.

(Objects of the Invention) The first object of the present invention is to provide a negative photosensitive material and a radiation image forming method that improve the sharpness of images by reducing cross-over light, and secondly,
It is an object of the present invention to provide a radiation-sensitive material that does not cause an increase in the amount of X-rays, has a small decrease in sensitivity, has high sharpness, and is silver-saving, and a radiation image forming method. A third object of the present invention is to provide a negative photosensitive material and a radiation image forming method in which photographic properties are less likely to deteriorate even when a fatigued developer is used.

(Structure of the Invention) The object of the present invention is to provide photosensitive silver halide grains in constituent islands provided on a support, the surface of which is made difficult to solubilize by an agent that makes it difficult to solubilize. In a negative-working silver halide photographic light-sensitive material containing metal salt particles that are more easily soluble than grains and have substantially no photosensitivity, and physical development nuclei, the photosensitive silver halide grains have a grain size equal to the grain thickness. Negative-working silver logon photographic light-sensitive material characterized by containing 5 times or more of tabular silver halide grains 1. and this negative type... containing at least one reducing agent and at least one substance capable of dissolving the metal salt particles after exposure to radiation in combination with the silver logon photographic material and the fluorescent screen. This can be achieved by a radiation image forming method that involves processing with a processing liquid. The present invention will be explained in more detail below.

The photosensitive silver halide grains used in the present invention are:
As mentioned above, the grains are tabular silver halide grains having a grain size of 5 times or more the grain thickness.

The tabular silver halide grains according to the present invention are prepared as follows.

[Homemade method for producing tabular silver halide particles]

Gelatin 12. ? , potassium bromide 0.3 g s water 72
0 ml of silver nitrate was added to a solution kept at 70°C.
A solution of 9 dissolved in 240 g of water and 25 g of potassium bromide
．． A solution of 4 g dissolved in 2401 rL of water was simultaneously added between the side pillows, and Ostwald ripening was performed for 5 minutes to obtain fine tabular silver bromide grains.

This tabular silver bromide grain emulsion is divided, a potassium bromide aqueous solution is added to a portion thereof to adjust the pBr to 0.8, and the remaining emulsion is gradually added as a source emulsion. It is possible to obtain such a tabular silver bromide grain emulsion.

The grain size of the tabular silver bromide grains obtained by the above preparation method varies depending on the use of the light-sensitive material, but is preferably in the range of 0.3 .mu.m to 3.0 .mu.m.

The silver halide composition of the photosensitive silver halide grains used in the present invention may be silver bromide, silver iodide, silver chloroiodobromide, or a mixture thereof, with silver iodobromide being preferred, but especially (silver iodobromide). ) Silver iodobromide containing less than mol % of silver iodide is preferred. The content of the tabular silver logonide grains according to the present invention is preferably 10 to 95%, particularly 10 to 90%, of the total projected area of the light-sensitive material. or 5% to 90% by weight of the total photosensitive silver halide grains, especially 10% by weight
% to 4ON amount% 〇 Photosensitive silver halide grains other than the tabular silver halide grains υ used in the present invention used in the above ratio in the present invention are also applied in the form of a silver halide emulsion. However, the silver halide emulsion can be produced by various manufacturing methods including the conventional manufacturing method, for example, the method described in Japanese Patent Publication No. 46-7772, and the method described in U.S. Pat. No. 2,592,250. It can be prepared by the so-called conversion emulsion method described, such as the single shot emulsion method and the double jet emulsion method.

Further, the photosensitive silver halide grains other than the tabular silver halide grains used in the present invention include grains having various crystal habits. Although the particle size varies depending on the purpose of use of the photosensitive material, a range of 0.1 to 3.0 μm is usually appropriate.

All of the above-mentioned Y-opening silver halide emulsions used in the present invention can be chemically sensitized using various chemical sensitizers. Chemical sensitizers include known sensitizers such as sulfur sensitizers, selenium sensitizers, and noble metal sensitizers, as well as reduction sensitizers,
A wide variety of sensitizers such as polyalkylene oxide sensitizers can be used.

Further, the above silver halide emulsion can also be spectrally sensitized using various sensitizing dyes. Furthermore, the generation of capri can be prevented using known stabilizers and antifoggants such as imidazoles, triazoles, and azaindenes.

Next, when the particles of the metal salt used in the photosensitive material according to the present invention are not subjected to nuclide on the surface by the eluent, the dissolution rate with respect to the substance (described later) that dissolves the metal salt particles is the same as that described above. It consists of a metal salt that is larger than that of photosensitive silver halide and has substantially no photosensitivity.

That is, to explain in more detail, the metal salt particle group (X)
The dissolution rate (or the mass of the substance dissolved per unit time) of the photosensitive silver halide grain group (Y) in the presence of at least one of the metal salt dissolving agents described below is (X), (Y
) When measured under the condition that the total mass of the particles contained in both particle groups is equal to each other, it is necessary that the mass of the particle group (X) is larger than that of the particle group (Y).

The following method is suitable as a measurement method for verifying whether such conditions are met.

First, two types of suspensions were prepared, each containing photosensitive silver halide particles and metal salt particles in a hydrophilic colloid.
Two types of samples are prepared by coating each on a support.

The application N at this time equalizes the amounts of photosensitive silver halide, metal salt, and hydrophilic colloid per unit area between the two samples.

In the measurement, sodium thiosulfate is used as a standard metal salt dissolving agent, and the obtained sample is immersed in a 5% aqueous sodium thiosulfate solution (heated at °C) without stirring. The immersion time is set at several levels, for example 2 seconds, 5 seconds, and 8 seconds.

Then, quickly transfer the sample to a water tank, wash with water, and then dry.

The residual photosensitive silver halide and residual metal salt amounts of the sample treated in this manner are analyzed and measured by a known method, and the residual rate (%) is calculated for each.

Draw a graph of the residual rate and immersion time, and calculate the value of tt/14 by subtracting the immersion time of 1° for the photosensitive silver halide sample and the immersion time t for the metal salt particle sample, which correspond to a residual rate of 50%.

The value of h/l+ thus determined needs to be smaller than 1, and preferably smaller than 0.7.

Although the metal salt particles are easily soluble in the above sense, they are also substantially non-photosensitive.

In this case, "substantially not having photosensitivity" in the present invention means "not being photosensitized" in a relative relationship with the photosensitive silver halide.

More specifically, when the light energy necessary to sensitize the photosensitive silver halide is applied to the light-sensitive material according to the present invention, the light energy causes "substantially no sensitization".
It should be understood that

More specifically, the metal salt particles of the present invention are preferably metal salt grains having a photosensitivity that is generally at most 1/10 that of the photosensitive silver halide.

The metal salt particles used in the present invention may be appropriately selected from those having the above properties.

However, in one embodiment of the present invention, the metal salt particles are silver halide grains having substantially no photosensitivity, and compared to the photosensitive silver halide grains, the metal salt particles are silver halide grains that are substantially non-photosensitive. Particles are selected that have a large dissolution rate for the substance that dissolves them.

More specifically, the metal salt particles preferably applied to the photosensitive material according to the present invention are pure silver chloride, pure silver bromide, or silver halides thereof, which have not been subjected to chemical sensitization treatment.
It is preferable that the crystals are finer than those of the photosensitive silver halide.

Gold used in the present invention JfA? The grains of A are 0.1 mol to 100 per mol of photosensitive silver halide.
% k range.

In addition, metal ions or metal complex ions generated as a result of dissolving such metal salt particles in the presence of a metal salt dissolving agent described below are reduced to metals in the presence of a reducing agent on physical development nuclei described later. Furthermore, as the physical development nuclei used in the present invention, for example, noble metals such as gold, silver, and platinum or their colloids, metal sulfides such as silver, palladium, and zinc, or metal selenides, etc. may be used. I can do it. Among these, metal colloids obtained by reducing gold or silver compounds (for example, chloroauric acid, silver nitrate, silver rogonide, etc.), silver sulfide, palladium sulfide, etc. are preferred.

Note that this physical development nucleus has a chemically active site that has the function of catalytically promoting the process in which metal ions or metal complex ions produced by dissolving the metal salt are reduced to metal by a reducing agent. 11゜The content of such physical development nuclei in a photosensitive material varies depending on its type, but for example, in the case of silver sulfide, it does not necessarily have to be physical particles. .1～～1.0,9
/IRQ range is appropriate.

Next, the specific compound for making the metal salt grains contained in the light-sensitive material used in the present invention insoluble is generally selected from compounds that make silver halide grains insoluble; for example, 1-phenyl-5- Mercaptotetrazo-y, 1-
Various compounds such as mercaptotetrazoles such as (p-ethoxyphenylene/I/)-6-mercaptotetrazole and those described in *TA No. 48544/1984 can be used.

The configuration of the present invention as described above can take various forms depending on the purpose or use.

That is, the photosensitive material used in the present invention has silver logonide particles (1)/[H-light properties/-silver gonide particles, (2) the above (1) on both sides of a transparent support.
Photosensitivity of 1: Easily soluble than silver logonide particles, and substantially non-photosensitive (1) Particles in which a poorly soluble agent is adsorbed to metal salt particles, (3) Physical development nuclei, and (4) ) Tabular shape: This is a type containing four elements of silver lokenide grains, but the above (il(2
1 and (3) may be contained in separate layers,
Alternatively, any two or more of the above (11 to (3)) may be contained in a single layer of -F.

The most preferable layer structure of the light-sensitive material according to the present invention is to coat a layer containing a mixture of metal salt particles and physical development nuclei from the support side, and on top of this is an emulsion layer containing tabular silver halide grains. A photosensitive copper halide emulsion layer containing substantially no tabular silver halide grains is provided thereon, and a retention layer is provided as the top layer. A tabular steel halide grain emulsion layer, then a layer containing a mixture of metal salt grains and physical development nuclei, a photosensitive silver halide emulsion layer substantially free of tabular silver halide grains thereon, and a layer containing a mixture of metal salt grains and physical development nuclei; It may consist of a four-layer structure with a protective layer on the upper layer, or it may consist of a U-containing layer consisting of a mixture of metal salt particles and physical development nuclei from the support side, followed by a layer containing tabular silver halide grains and other photosensitive halogens. Examples include a three-layer structure including an emulsion layer containing a mixture of silver oxide grains and a protective layer as the uppermost layer.

The structure of the photosensitive material according to the present invention is as described above, but the photosensitive material may be provided with a protective layer, an intermediate layer, an auxiliary layer, etc. at appropriate positions as required.

Although various hydrophilic colloids can be used as the binder, gelatin is typically preferably used.

In addition, for the purpose of improving the physical properties of a coating film using the above-mentioned hydrophilic colloid as a binder, various film property improving agents such as hardeners can be used as necessary.

Coating film compositions containing hydrophilic colloid as a binder may optionally contain photographic additives such as gelatin plasticizers, surfactants, matting agents, antistatic agents, thickeners, and other additives as necessary. A silver halide developer or the like may be used within a range that does not impair the effects of the present invention.

As the support, transparent supports such as films of cellulose acetate, cellulose nitrate, polyethylene terephthalate, polyamide, polypropylene, polycarbonate, etc. are appropriately selected depending on the intended purpose.

The light-sensitive material according to the present invention is exposed to X-rays by attaching fluorescent intensifying screens (for example, for high-sharp direct X-ray of calcium tungstate) to both sides, and then using a substance that dissolves the reducing agent and the gold salt particles. It is used by treating it with a treatment solution containing.

As the reducing agent, silver halide developing agents well known in the art are preferably used, and these include C, E,
0Meet and co-authored by T and L James “The Th
theory of the Photographic
Process j 3rd edition (1966 Macmill
an, Go・-N, Y) Chapter 13, or
P, A, Moaon arrival [Photography
c Processing Chemistry J (
1966The Pocal Press London
They are described in detail on pages 16 to 16 and can be used alone or in combination.

Further, the substance used in the treatment liquid that dissolves metal salt particles is a substance that acts on metal salt particles to generate metal ions or soluble metal complex ions, and according to a preferred embodiment of the present invention, The solubilizing agent is either a substance that does not substantially dissolve the photosensitive silver rhodanide, or it is a substance that has a concentration that does not substantially dissolve the photosensitive silver rhodanide.
), preferably a substance that dissolves metal salt fine particles having a solubility different from that of photosensitive silver halide (a typical example of such a dissolving agent is sulfite)
Sulfites such as IJum, sodium thiosulfate, thiosulfates such as potassium thiosulfate, ammonium thiosulfate,
Hydrocyanates such as potassium cyanide and sodium thiocyanide, thiocyanates such as sodium thiocyanide and potassium rhodan, amino acid compounds such as cystine and cysteine, thymeurea, phenylthiourea, 3,6-di-thia-1, Examples include thio deep purple compounds such as 8-octadiol, thioether compounds, and the like.

Among the above, sodium sulfite is generally used as a preservative for processing solutions, so it is 1! Usage amount per unit is 0.1&~100 f! , more preferably 10g
The pH of such a processing solution is preferably 5 or more, preferably about 5.5 to 13.2. <Various additives such as a thickening agent, a development accelerator, and an anti-capri agent can be contained. The suitable temperature for the SHI-C treatment is in the range of 20°C to 50'C. The typical processing time ranges from 5 seconds to 6 minutes.

Through treatment with such a treatment liquid, the photosensitive silver halide grains in the exposed areas are reduced by the reducing agent, and the resulting halogen ions, especially iodide ions and bromide ions, are nuclided on the surface by the refractory agent. Destroys metal salt particles present.

As a result, the metal salt particles are dissolved in the presence of the metal salt dissolving agent, deposited on the physical development nuclei, and blackened by the reducing agent to form a negative image imagewise.

After processing, a commonly known black-and-white light-sensitive material processing method such as stopping, fixing, and washing with water may be followed.

According to the present invention, a radiation image forming method using a photosensitive material having the above structure according to the present invention is compared to a radiation sensitive material made by a conventional method, which saves silver by incorporating the three above-described elements into a car. As a result, the sensitivity is increased, and the sharpness of radiographic images, which is the object of the present invention, is further improved and improved. That is, the radiation image forming method using a photosensitive material containing the four elements according to the present invention substantially improves the sharpness of images by substantially eliminating crossover light. Further, deterioration of photographic properties due to developer fatigue is improved.

Overall, the effects of the present invention are outstanding in that excellent radiation (medical X-ray photography) images can be stably obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1゜(Preparation of tabular silver halide emulsion) Gelatin 7129. Potassium bromide 0.3. ji+, water 72
In a 70°C solution containing 0 m
A solution containing 6g and 240ff14 of water! A solution containing 25.4 p of potassium bromide was added at the same time between extractions, and Ostwald ripening was performed for 5 minutes to obtain a fine-grain tabular silver bromide emulsion [A].

After adding potassium bromide aqueous solution to a part of the above emulsion (All) to adjust the par to 0.8, the remaining part of emulsion [A] was gradually added as a source emulsion, and as shown in Table 1 below. Two types of tabular silver bromide emulsions CB) and (C) were obtained.

(Preparation of photosensitive silver halide emulsion) A high-sensitivity silver iodobromide emulsion containing 3.5 mol% of silver iodide prepared by a forward mixing method and further ripened to maximum sensitivity by gold sensitization and sulfur sensitization. 4-hydroxy- as a stabilizer
6-Methyl-1,3,3a,7-tetrazaindene was added in an amount of 0.2 g per mole of silver halide to prepare a photosensitive silver gundide grain emulsion at °C.

The average grain size of this emulsion was about 13 μm. This emulsion is referred to as emulsion [D]. The average grain size and thickness ratios of emulsions CB), Cc:] and [D] are as shown in Table 1 below.

Table 1 [Preparation of metal salt particles (substantially non-photosensitive silver I-rodanide particles)] A pure silver chloride emulsion consisting of silver nitrate and sodium chloride was prepared by a neutral method. The average grain size of this emulsion is approximately 0.1μ.
It was m.

[Preparation of physical development nuclei]

Add 50 units of 0.2% chloroauric acid to 10ml of an aqueous solution of 1% polyvinyl alcohol (degree of saponification 99% degree of polymerization 1.000), stir at room temperature, and add 1% sodium borohydride. 10 ml was added to form a physical development nucleus for gold colloid.

Among the four types prepared by the above method, firstly, 1-phenyl-5-mercaptodetrazole was added to a silver chloride emulsion as gold maple salt particles in combination with a eluent and 1 part of the silver chloride. Add 1,2y per mole in methanol solution, followed by C,
After adding a suitable amount of saponin, 120 of the above-mentioned physical development nuclei were added in the form of chloroauric acid per mole of silver chloride emulsion.

During application, it was applied uniformly to both sides of a polyethylene terephthalate base that had been subjected to U&M undercoating.

Subsequently, appropriate amounts of saponin and formalin as a hardening agent were added to the tabular halogenated grain emulsion and photosensitive silver halide emulsion, and from step 10, uniform coating was applied on both sides of the silver chloride coating layer. did.

The coating amount on both sides of the sample coated and dried in this way is that the silver amount in the silver chloride layer is 1.011/lri', and the silver amount in the tabular silver halide grain emulsion layer and the photosensitive silver halide emulsion layer is 3. ．． Of//go was.

The layer structure of the light-sensitive material, which is a sample according to the present invention obtained as described above, has a layer structure from the support side: a layer containing a mixture of metal salt particles and physical development nuclei, then a tabular silver halide grain emulsion layer, and a photosensitive layer on top of the layer containing a mixture of metal salt particles and physical development nuclei. A silver halide emulsion layer and a protective layer are coated as the uppermost layer in this order.

On the other hand, as comparison samples, we added appropriate amounts of saponin and formalin as a hardening agent to a tabular halogenated silver grain emulsion, a light-sensitive silver halide emulsion, and a mixed emulsion. A sample was also prepared in which both sides of the polyethylene terephthalate film support were uniformly coated. Amount of silver coated on both sides of the comparative sample coated and dried in this manner #: t3. It was Og/d.

Each of the obtained samples was subjected to double-sided wedge exposure with 3.20 MS light. Next, the side blocks were developed with a processing solution having the following formulation at 50C, followed by fixation, washing with water, drying, and then sensitometric IJ-.The results are shown in Table 2 below.

(Treatment liquid prescription) Phenidone 1. OL! 9 Anhydrous sodium sulfite 6Q l/Hydroquinone 16. 9 Beautifying Potassium 2.0g K2CO33517 5-Methylbenzotriazole 40~Glutaraldehyde (25%) Add 5ml water to make it to ]2nd table This display is based on the specific sensitivity of Sample 4 as 100. be. In addition, gamma is indicated by the slope of the straight calf on the characteristic curve.

Based on the data in Table 2, samples Nl 1 , 3. ,,4
,.

As is clear from the results shown in Table 3 below using the two-way arrangement method for 6.10 and 15, the tabular silver halide grain emulsion according to the present invention and the conventional photosensitive... A negative-tone light-sensitive material produced by the diffusion transfer method and having a constituent layer containing the above-mentioned in combination can obtain island sensitivity without deterioration of gamma.

Furthermore, for samples 11k14.6 and 15, the sharpness was measured by OTF and was 1.5, 2.0, 2, respectively.
．． The results of the spatial frequency Cl1ns/ioa 1 at 5 are shown in Table 4 below.

As a method for measuring sharpness, first, a medical grade, which is a commercially available radiation-resistant photosensitive abrasive, was irradiated with X-rays as a reference sample, and the sharpness of the th image was measured for each sample.

Using a sharpness OTF, place an OTF measurement chart with a square wave made of lead from 0.8 to LO line/Ryu on the back side of the front side of the calcium tungstate direct intensifying screen, and X-rays were irradiated so that the concentration of the portion not shielded by lead chard was approximately 1.0 on both sides.

After processing, peel off only the emulsion layer on the front side with respect to the It was measured using a product made by Kogyo Co., Ltd.

The aperture size at this time is 230 μm in the parallel direction of the rectangular wave, 6 μm in the perpendicular direction, and the magnification is 10.
It was 0 times.

Table 4 From the results in the above table, it is found that l-stain material Nn 15 related to the present invention
Fi, excellent sharpness compared to samples outside the present inventionC
I know that there is. Furthermore, it can be seen that the sharpness is improved when compared with sample Nn6t/'i, which has only a tabular silver halide grain emulsion, and sample grade 4, which has a normal light-sensitive silver halide emulsion. It has also become clear that it will not reach 15. Furthermore, sample Nn 1 of the present invention
It is also understood that although it is an I'i-saving silver-sensitive material, it does not fade compared to the sharpness of the current high-silver content photosensitive material, X-Ray Type A.

Example 2 Using the above-mentioned developer, a commercially available radiation-sensitive material, Sakshi X-Ray Film Type A (Konishiroku Photo Industry Co., Ltd.)
A four-cut size of a commercially available commercially available product (manufactured by J.D. Co., Ltd.) was exposed to light and processed to give a density of approximately 1.0 after development, thereby preparing three types of fatigue developers as shown in the table below.

Then sample N' made V+l in run f9++1
3.2 CMS for J41516.12 and 15
Table 5 below shows the results of double-sided wenge exposure using the light of 200 nm and processing with the fatigue developer prepared above.

Table 5 As is clear from the results in the above table, sample Nn15 according to the present invention is different from other comparative samples 4, 5, 6 and 1.
It can be seen that the resistance to fatigue developing solution was significantly improved compared to No. 2.

(Effects of the Invention) According to the light-sensitive material of the present invention, which has a tabular parogonized steel grain emulsion and a photosensitive rodanized steel emulsion as constituent layers on a support, and a radiation image forming method using the light-sensitive material, Image sharpness due to crossover light and deterioration of photographic properties due to busy and fatigued developer can be significantly improved.

Procedural amendment document March 15, 1985 Patent Application No. 13954 of 1988 2, Title of invention: Ne-type silver halide photographic light-sensitive material and radiation image forming method 3, Person making amendment Relationship with the case Patent applicant 1 Sakura-cho, Hino-shi, Tokyo 191, Japan The following correction is made.

Claims (4)

[Claims] (1) The photosensitive silver halide grains in the constituent layer provided on the support, whose surfaces have been made difficult to dissolve with an insoluble agent, are themselves more easily soluble than the photosensitive silver halide grains and are substantially more soluble than the photosensitive silver halide particles. In a negative-working silver halide photographic light-sensitive material containing metal salt particles and physical development nuclei that are not photosensitive to , the photosensitive silver halide grains include tabular silver halide grains having a grain size of 5 times or more the grain thickness. A negative-working silver halide photographic material characterized by containing. (2) Claim 1 having a light-sensitive silver halide emulsion layer of at least 1/i# on the outside of the support from the halide emulsion layer containing tabular silver halide grains.
Negative-working silver halide photographic material as described in . (3) The photosensitive silver halide grains in the constituent layer provided on the support, whose surfaces have been made difficult to dissolve with an insoluble agent, are themselves more easily soluble than the photosensitive silver halide grains and substantially more soluble than the photosensitive silver halide grains. A negative silver halide photographic light-sensitive material containing metal salt particles and physical development nuclei that are not sensitive to light is combined with a fluorescent intensifying screen, and after exposure to radiation, at least one
In the radiation image forming method of processing with a processing liquid containing a reducing agent and at least one substance that dissolves the metal salt particles, the photosensitive halogenated particles have a particle size of 5 times or more the particle thickness. A radiation image forming method comprising tabular silver halide grains. (4) Claim 3, characterized by having at least one photosensitive silver halide emulsion layer on the outside of the support from the silver halide grain emulsion layer containing tabular silver halide grains. The radiation image forming method described in Section 1.