JPH10213885A - Image forming method for silver halidephotographic sensitive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the method for forming an X-ray image by exposing the silver halide photographic sensitive material brought into close contact with a fluorescent sensitizing paper composed essentially of an yttrium tantalate type fluorescent material and forming an image high in sensitivity and sharpness and contrast and good in graininess and holding environmental aptitude. SOLUTION: This silver halide photographic sensitive material is provided on one side of a support with at least one silver halide emulsion layer containing flat silver halide grains having an aspect ratio of >=2 and a silver iodide content of >=0.5mol% and this material is brought into close contact with the fluorescent sensitizing paper composed essentially of the yttrium tantalate type fluorescent material and exposed to X-rays and processed with a developing solution containing 0.3-1.2mmol/l iodine ions and reductones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method, and more particularly, to a method using a silver halide photographic light-sensitive material (hereinafter, also simply referred to as a "light-sensitive material") and a fluorescent intensifying screen mainly containing yttrium tantalate-based phosphor. The image forming method.

[0002]

2. Description of the Related Art The emission of a yttrium tantalate-based phosphor has a higher emission intensity than that of a generally used calcium tungstate-based phosphor, and the emission wavelength peak is located in the ultraviolet region. And has an emission intensity three times or more higher than that of calcium tungstate. Therefore, the yttrium tantalate-based phosphor not only increases the sensitivity of the intensifying screen and is advantageous for reducing the exposure dose, but also for halogen. The grain size can be improved by reducing the size of silver halide grains used in the silver halide emulsion. However, a silver halide emulsion having a small grain size has a disadvantage that the contrast is reduced.

[0003] On the other hand, from the standpoint of environmental pollution, treatment methods using reductones having a low environmental load have been studied in place of dihydroxybenzenes which have been conventionally used. A drop occurs.

Accordingly, there has been a demand for an image forming method for a silver halide photographic light-sensitive material having a good sensitivity, granularity and sharpness by a processing method with a small environmental load.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a photosensitive material which is in close contact with a fluorescent intensifying screen containing a yttrium tantalate-based phosphor as a main component and which is subjected to X-ray exposure to impart environmental compatibility. An object of the present invention is to provide an image forming method capable of obtaining an image having high sensitivity, high sharpness, high contrast and good granularity by developing with a liquid.

[0006]

Means for Solving the Problems The present inventor has studied the image forming method for reducing the exposure dose, imparting environmental suitability, and greatly improving the graininess and sharpness. Reached.

The above object of the present invention is achieved by the following constitution.

[0008] 1. The support has at least one silver halide emulsion layer on one side, and the silver halide grains in the emulsion layer have an average aspect ratio of 2 or more and a silver iodide content of 0.5 mol% or more. After a silver halide photographic material is exposed to X-rays with a fluorescent intensifying screen containing yttrium tantalate-based phosphor as a main component, 0.3 to 1.2 mmol of iodine ions per liter of developer and reductones An image forming method comprising treating with a developing solution containing:

[0009] 2. 2. The image forming method according to 1, wherein the developer does not substantially contain hydroquinone.

[0010] 3. 3. The image forming method according to claim 1, wherein the developer is a developer prepared by dissolving a solid developer in water.

That is, a light-sensitive material having a silver halide emulsion containing tabular silver halide grains having a composition having an average aspect ratio of 2 or more and a silver iodide content of 0.5 mol% or more is made of an yttrium tantalate-based material. The object of the present invention is achieved by subjecting a fluorescent intensifying screen having a phosphor as a main component to contact exposure with a fluorescent intensifying screen, and treating with a developing solution containing 0.3 to 1.5 to mmol of iodine ion and reductone per liter of the developing solution. Found to be achieved.

Furthermore, it has been found that a developer substantially free of dihydroxybenzenes can improve the environmental suitability and at the same time provide a stable processing system. Also, by using a solid developer containing reductones,
It has also been found that since the storage stability of the developer is significantly improved, the stability of granularity during long-term processing is increased.

Hereinafter, the present invention will be described in more detail.

The silver halide grains of the present invention are tabular grains having an average aspect ratio of 2.0 or more, which is an average value of grain diameter / thickness (referred to as aspect ratio), preferably 2.0 to 2.0. 15, more preferably 3.0 to 9.

The particle size of the tabular silver halide grains of the present invention is desirably 1.0 μm or less, and preferably 0.3 to 0.7 μm, in order to further exert the effects of the present invention.

The average thickness of the tabular silver halide grains of the present invention is preferably 0.5 μm or less, particularly preferably 0.3 μm or less.
μm or less.

In the present invention, the particle size of the tabular silver halide grains is defined as the diameter of a circle having an area equal to the projected area of the grains from observation of electron micrographs of the silver halide grains.

In the present invention, the thickness of the tabular silver halide grains is defined as the minimum of the distance between two parallel planes constituting the tabular silver halide grains, that is, the distance between the main planes. .

The thickness of the tabular silver halide grains can be determined from an electron micrograph of the silver halide grains having a shadow by a carbon replica method or an electron micrograph of a sample slice obtained by coating a silver halide emulsion on a support and drying. You can ask.

In order to determine the average aspect ratio,
The aspect ratio of particles of at least 2000 samples is measured, and the average value is defined as the average aspect ratio.

In the silver halide emulsion of the present invention, the ratio of tabular silver halide grains to all silver halide grains is preferably at least 50%, more preferably 6%.
0% or more, particularly preferably 70% or more. Monodisperse tabular silver halide grains are preferably used, and those having a variation coefficient of grain size within a range of 20% or less are particularly preferably used.

The silver halide composition of the tabular silver halide grains has a silver iodide content of 0.5 mol% or more, preferably 0.5 to 3.0 mol%, more preferably 0.5 to 3.0 mol%.
1.5 mol%. When the silver iodide content is less than 0.5 mol%, the maximum density and contrast are greatly reduced, and the graininess is not improved. As silver halide, silver iodide is particularly preferred, but silver bromide, silver iodobromide, silver chloride and the like are also preferably used.

The light-sensitive material of the present invention has at least one silver halide emulsion layer on one side of the support, preferably 2 to 10 layers, more preferably 2 to 5 layers, particularly It is preferable to have two silver halide emulsion layers.

The sensitivity of the silver halide emulsion layer closest to the support of the light-sensitive material of the present invention is preferably at least 20% higher than the sensitivity of the emulsion coated on the other silver halide emulsion layers. Is preferably at least 35% higher,
In particular, it is preferably higher by 50% or more.

The emulsion of the present invention can be produced by referring to a known method. For example, Research Disclosure (R
D) No. 17643 (December 1978), 22-2
"Emulsion Preparation" on page 3
and Types, or the RD No.
18716 (November 1979), p.648.

Further, the emulsion of the present invention can be prepared, for example, using T.I. H. Ja
“The Theory of the Pho”
graphical process "4th edition, Mac
The method described in Millan Co. (1977) pp. 38-104, G.I. F. "Photograph by Duffin
Hic Emulsion Chemistry ", F
ocal Press (1966); Gla
Chikim et Physique by Fkides
e Photographique "Paul Mon
tel (1967) or V.T. L. Zelikma
n, et al., Making And Coating Ph
autographic Emulsion ”Foca
1 can be prepared by referring to the method described in Press, etc. (1964).

That is, mixing conditions such as a forward mixing method, a reverse mixing method, a double jet method and a control double jet method under solution conditions such as an acidic method, an ammonia method, and a neutral method;
The particles can be produced by using particle preparation conditions such as a conversion method and a core / shell method, and a combination thereof.

In the silver halide emulsion used in the present invention, the silver halide composition may be uniform within the grains or silver iodide may be localized. Localized ones are preferably used.

A method for producing a silver halide emulsion is disclosed in
8-113926, 58-113927, 58
JP-A-113934, JP-A-62-1855, European Patents 219,849 and 219,850 can also be referred to.

As a method for producing a monodisperse tabular silver halide emulsion, JP-A-61-6643 can be referred to.

As a method for producing a monodisperse tabular silver iodobromide emulsion having a high aspect ratio,
A silver nitrate aqueous solution is added to a gelatin aqueous solution in which pBr is kept at 3 or less, or a silver nitrate aqueous solution and a halide aqueous solution are added by a double jet method to generate seed crystals, and then a ripening step and further a double jet method are performed. It can be obtained through a growth step.

The size and shape of the tabular silver halide grains can be controlled by the temperature at the time of grain formation, silver potential, pH, and the rate of addition of the aqueous silver salt solution and the aqueous halide solution.

The silver halide composition ratio of the silver halide emulsion can be controlled by changing the composition of the aqueous halide solution to be added, that is, the ratio of chloride bromide to iodide.

In preparing a silver halide emulsion, a silver halide solvent such as ammonia, thioether, or thiourea can be used, if necessary.

The above-mentioned emulsions are prepared from silver halide grains 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 latent image type in which a latent image is formed on the surface and inside. Or any of the above emulsions. In these emulsions, iron salts, cadmium salts, lead salts, zinc salts, thallium salts, ruthenium salts, osmium salts, iridium salts or complex salts thereof, rhodium salts or complex salts thereof are added at the stage of physical ripening or grain preparation, You may mix in silver halide grains.

The silver halide emulsion of the present invention may be subjected to a water washing method such as a Nudel washing method or a flocculation sedimentation method in order to remove excess soluble salts. As a preferred water washing method, for example, a method using an aromatic hydrocarbon aldehyde resin containing a sulfo group described in JP-B-35-16086, or an agglomerated polymer agent described in JP-A-2-7037, examples G3 and G8, etc. The method used is a particularly preferred desalting method.

The silver halide emulsion of the present invention is preferably subjected to chemical sensitization. As a sensitization method for increasing the sensitivity of the silver halide emulsion of the present invention, it is preferable to use both chalcogen sensitization and gold sensitization. In particular, the combined use of gold sensitization, sulfur sensitization and selenium sensitization is preferable because not only the sensitizing effect is remarkable but also the fogging suppressing effect can be obtained.

In the present invention, various photographic additives can be used in the silver halide emulsion before and after physical ripening or chemical ripening. Known additives include:
For example, the RDNo. 17643 (December 1978
Mon.) 23-29, ibid. 18716 (1979 1
January) pages 648 to 651 and the same No. 308119
(December, 1989), pp. 996-1009.

The preferred addition position may be any position during the production process of the light-sensitive material of the present invention, but is preferably a step after the chemical sensitization step of the emulsion, and particularly preferably the addition step during the preparation of the emulsion. .

As the support for use in the light-sensitive material of the present invention, for example, RD-17643, page 28 and RD-3
08119, p. 1009. A suitable support is a polyethylene terephthalate film or the like, and the surface of these supports may be provided with an undercoat layer, or subjected to corona discharge, ultraviolet irradiation or the like in order to improve the adhesion of the coating layer.

The fluorescent intensifying screen mainly comprising the yttrium tantalate-based phosphor of the present invention is disclosed in JP-A-4-30099.
No. 3 etc. are intensifying screens using an yttrium tantalate phosphor. For example, a fluorescent intensifying screen using yttrium tantalum oxide as a phosphor, Ultravision First Dieter UVFD (Du Pont)
Co., Ltd.), but the present invention is not limited to these.

The amount of iodine ions in the developer of the present invention is from 0.3 to 1.2 mmol, preferably from 0.3 to 1.0 mmol, per liter of the developer. The counter cation may be a potassium ion or a sodium ion.

In the present invention, the term "developer substantially not containing a dihydroxybenzene-based developing agent" means, for example, a trace amount of 5 × 10 ^-5 mol or less per liter of a developer. Preferably, it does not contain any benzenes.

Next, the reductons of the present invention will be described.

The reductones of the present invention include an enediol type, an enaminol type, an enediamine type, a thiol enol type and an enamine thiol type. Preferably, a compound represented by the following general formula (1) is specifically exemplified.

[0046]

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In the formula, R ₁ and R ₂ each represent a hydrogen atom or a hydroxyl group; R ₃ and R ₄ each represent a hydroxyl group, an amino group, a mercapto group or an alkoxy group having 1 to 5 carbon atoms; Represents an integer of 4.

The compound represented by the general formula (1) includes
The specific compounds are shown below.

[0049]

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[0050]

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The reductones of the present invention can be used in the form of an alkali metal salt such as a lithium salt, a sodium salt and a potassium salt. The most preferred reductones in the present invention include ascorbic acid, erythorbic acid and the above-mentioned metal salts represented by 1-1. The amount of these reductones to be added is preferably from 1 to 100 g, more preferably from 5 to 50 g per liter of developer.

As a developer, dihydroxybenzenes can be used. Examples of the dihydroxybenzenes that can be used include hydroquinone, chlorohydroquinone, bromohydroquinone, isopropylhydroquinone, methylhydroquinone, 2,3-dichlorohydroquinone, 2,5-dichlorohydroquinone, and 2,3-dichlorobenzene.
There are dibromohydroquinone, 2,5-dimethylhydroquinone, hydroquinone monosulfonate and the like, but hydroquinone is particularly preferred. The amount of the dihydroxybenzenes to be added is from 0.01 mol / liter to 1 liter of the developer.
0.7 mol, preferably 0.1 to 0.5 mol,
As described above, in the present invention, the amount is particularly preferably 5 × 10 ⁻⁵ mol or less.

In the developer of the present invention, in addition to the above compounds,
Pyrazolidones (for example, 1-phenyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone,
1-phenyl-5-methyl-3-pyrazolidone, 1-phenyl-4-ethyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone, 1-phenyl-4-methyl-4-hydroxymethyl -3-pyrazolidone, 1-phenyl-4,4-dihydroxymethyl-3-
Pyrazolidone, 1,5-diphenyl-3-pyrazolidone, 1-p-tolyl-3-pyrazolidone, 1-phenyl-2-acetyl-4,4-dimethyl-3-pyrazolidone, 1-p-hydroxyphenyl-4,4 -Dimethyl-
3-pyrazolidone, 1- (2-benzothiazolyl) -3
-Pyrazolidone, 3-acetoxy-1-phenyl-3-
Pyrazolidone, etc.), 3-aminopyrazolines (for example,
1- (p-hydroxyphenyl) -3-aminopyrazoline, 1- (p-methylaminophenyl) -3-aminopyrazoline, 1- (p-amino-m-methylphenyl)-
3-aminopyrazoline and the like and phenylenediamines (for example, 4-amino-N, N-diethylaniline, 3
-Methyl-4-amino-N, N-diethylaniline, 4
-Amino-N-ethyl-N-β-hydroxyethylaniline, 3-methyl-4-amino-N-ethyl-N-β-
Hydroxyethylaniline, 3-methyl-4-amino-
N-ethyl-N-β-methanesulfonamidoethylaniline, 3-methyl-4-amino-N-ethyl-N-β-
Methoxyethylaniline, etc.) can be added.

Further, even when aminophenols are used as an auxiliary developing agent, a high contrast image can be obtained. Examples of the aminophenol developing agents include 4-aminophenol, 4-amino-3-methylphenol, and 4-aminophenol.
(N-methyl) aminophenol, 2,4-diaminophenol, N- (4-hydroxyphenyl) glycine,
N- (2'-hydroxyethyl) -2-aminophenol, 2-hydroxymethyl-4-aminophenol, 2
-Hydroxymethyl-4- (N-methyl) aminophenol and hydrochlorides and sulfates of these compounds.

The amount of these compounds to be added is preferably 0.2 to 40 g per liter of the developing solution, more preferably 0.1 to 40 g.
5 to 25 g.

In the developer in the image forming method of the present invention, an organic reducing agent can be used as a preservative in addition to the sulfite described in JP-A-6-13859. In a developer using the reductone of the present invention as a developing agent, the concentration of sulfite is preferably 0.05 to 0.30 mol per liter of the developer. Sodium salts and potassium salts can be used as sulfites, and sodium salts and potassium salts can be used as metabisulfites.

An amine compound can be added to the developer, and the compounds described in US Pat. No. 4,269,929 are particularly preferred. Further, it is necessary to use a buffer, and examples of the buffer include sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, trisodium phosphate, tripotassium phosphate, dipotassium phosphate, sodium borate, and potassium borate. Sodium tetraborate (boric acid), potassium tetraborate, sodium o-hydroxybenzoate (sodium salicylate), potassium o-hydroxybenzoate, sodium 5-sulfo-2-hydroxybenzoate (sodium 5-sulfosalicylate) , 5-sulfo-2
Potassium-hydroxybenzoate (potassium 5-sulfosalicylate) and the like can be mentioned, but a carbonate is preferable.

In addition, chelating agents and biodegrading agents described in JP-A-6-138593 can be used.

It is preferable to use a carbonate in the developer using the reductone of the present invention. The amount of the carbonate added is preferably 0.3 mol or more, more preferably 0.5 to 1.5 mol, per liter of the developer.

Examples of the development accelerator include thioether compounds, p-phenylenediamine compounds, quaternary ammonium salts, amine compounds, polyalkylene oxides, 1-phenyl-3-pyrazolidones, and the like.
Hydrazines, ionic compounds, mesoionic compounds,
Imidazoles and the like can be added as needed.

As the antifoggant, potassium bromide or an organic antifoggant can be used. Examples of the organic antifoggant include benzotriazole, 6-nitrobenzimidazole, 5-nitroisoindazole, 5-methylbenzotriazole, 5-nitrobenzotriazole, and 5-nitrobenzotriazole.
Examples include nitrogen-containing heterocyclic compounds such as chloro-benzotriazole, 2-thiazolyl-benzimidazole, 2-thiazolylmethyl-benzimidazole, indazole, hydroxyazaindolizine, and adenine, and a typical organic antifoggant contains a mercapto group. Compound,
General formulas [I] and [I] described in JP-A-7-114153.
The compounds represented by I], [III] and [IV] can be used, but it is preferable to use the general formula [I-α].

Further, if necessary, methyl cellosolve,
Methanol, acetone, dimethylformamide, cyclodextrin compound, and other JP-B-47-33378
And the compounds described in JP-A-44-9509 can be used as an organic solvent for increasing the solubility of the developing agent. Further, various additives such as a stain inhibitor, an anti-sludge agent, and a layering effect promoter can be used.

Glutaraldehyde, a sulfite adduct thereof, or a sulfate may be used as a developing hardener. Further, a silver sludge inhibitor is disclosed in JP-A-5-252.
Nos. 89255 and 6-308680 [4]
-A] and the compounds represented by [4-b] can be used.

Prior to the treatment, it is preferable to add a starter, and it is also preferable to add the solidified starter. As the starter, in addition to an organic acid such as a polycarboxylic acid compound, a halide of an alkali metal such as KBr, an organic inhibitor, and a development accelerator are used.

The processing temperature of the developer is preferably 25 to 5
At 0 ° C, more preferably 30 to 40 ° C. The development time is from 5 to 25 seconds, more preferably from 5 to 15 seconds. The total processing time in the present invention is Dry to Dry
Is preferably 90 to 30 seconds. Here, the total processing time Dry to Dry refers to the total processing time from the moment when the photosensitive material to be processed is immersed in the developing solution to the time when the photosensitive material is discharged through development, fixing, washing and drying steps.

The replenishing amount of the processing solution was 1 m ² of the photosensitive material.
The development replenisher is preferably 65 to 520 ml, more preferably 65 to 520 ml. The fixing replenisher is preferably from 65 to 910 ml, more preferably from 65 to 390 ml, per m ² of the photographic material. Particularly preferably, the developer and the fixing are 65 to 390 m per m ^{2 of the} photosensitive material.
l.

The reduction of the replenishing amount of the processing solution is effective in reducing the load on the waste solution processing, and is desired from the viewpoint of environmental suitability.
The above preferred range is desired.

The opening ratio of the developing tank is 0.03 to reduce the air oxidation resistance of the developing solution and to reduce the concentration due to evaporation of water.
Or less, more preferably 0.02 or less.
The opening ratio of the fixing tank is also preferably 0.04 or less.

The pH of the developer is preferably from 9.0 to 10.5, more preferably from 9.0 to 10.2, in order to obtain stability of the reductones.

Further, the processing conditions are as follows: l ^0.75 × t = 20-4
It is preferably represented by 0 and processed by a roller transport type automatic developing machine.

In the formula, 0.7 <l <4.0, and l represents the length (unit = m) of the transport path from the core of the first roller of the film insertion port to the core of the last roller of the film drying port. , T
Represents the time (unit = second) required to pass through l.

Next, the solid processing agent preferably used in the image forming method of the present invention will be described.

In the image forming method of the present invention, the agent for diluting and adjusting the developing solution and the fixing solution is preferably one solution if it is a concentrated solution kit, and more preferably a solid processing agent. The solid processing agent is useful because it can significantly reduce the space and weight compared to the conventional liquid preparation kit.

The solid processing agent used in the present invention is a powder processing agent, a solid processing agent such as tablets, pills, granules, etc., which has been subjected to a moisture-proof treatment as required.

The term “powder” used in the present invention refers to an aggregate of fine crystals. Granules are obtained by adding a granulation step to powder, and refer to granules having a particle size of 50 to 5000 μm. The tablet referred to in the present invention refers to a tablet obtained by compression-molding a powder or granules into a certain shape.

In order to solidify the photographic processing agent, a concentrated solution or a fine powder or a granular photographic processing agent and a water-soluble binder are kneaded and molded, or the water-soluble binder is temporarily added to the surface of the photographic processing agent. Arbitrary means such as forming a coating layer by spraying can be adopted (JP-A-4-29136, 4-855).
No. 35, No. 4-85536, No. 4-85533, No. 4-85534, No. 4-172341).

A preferred tablet production method is a method of granulating a powdery solid processing agent and then forming the same through a tableting step. There is an advantage that the solubility and storage stability are improved and the photographic performance becomes stable as compared with a solid processing agent formed by simply mixing a solid processing agent component and forming a tablet.

As a granulation method for tablet formation, known methods such as tumbling granulation, extrusion granulation, compression granulation, pulverization granulation, stirring granulation, fluidized bed granulation, and spray drying granulation are used. Can be done.
For tablet formation, the average particle size of the obtained granulated product is 100 to 800 μm in that, when the granulated product is mixed and compressed under pressure, the components become non-uniform, so-called segregation is unlikely to occur.
It is preferred to use
７750 μm.

The particle size distribution is preferably such that 60% or more of the granulated particles have a deviation of ± 100 to 150 μm.
Next, when the obtained granules are compressed under pressure, a known compressor, for example, a hydraulic press, a single-shot tableting machine, a rotary tableting machine, or a pricketting machine can be used. The solid processing agent obtained by pressurizing and compression can take any shape, but from the viewpoint of productivity, handleability, or the problem of dust when used on the user side, a cylindrical, so-called tablet is used. preferable.

More preferably, at the time of granulation, the above effect is further remarkable by separately granulating an alkali agent, a reducing agent, a preservative and the like for each component.

The method for producing a tablet processing agent is described, for example, in JP-A-51-61837, JP-A-54-155038, and JP-A-52-55038.
No.-88025, British Patent No. 1213808 and the like. Further, granulating agents are described in, for example, JP-A Nos. 2-10942 and 2-109043.
And JP-A-3-39735, JP-A-3-39939, and the like. Further, the powder processing agent can be prepared by a general method as described in, for example, JP-A-54-133332, British Patents 725,892 and 729,862 and German Patent 3,733,861. Can be manufactured.

[0082] The bulk density of the solid processing agent, and in view of its solubility, preferably when 1.0g / cm ³ ~2.5g / cm ³ tablets from the viewpoint of the effect of the object of the present invention, 1 .0
g / cm ³ , the strength of the resulting solid is:
If it is less than 2.5 g / cm ³ , it is more preferable in terms of solubility of the obtained solid. When the solid processing agent is a granule or powder, the bulk density is preferably from 0.40 to 0.95 g / cm ³ .

The solid processing agent preferably used in the present invention is used for a photographic processing agent such as a developer, a fixing agent, and a rinsing agent, but the effect of the present invention, particularly the effect of stabilizing photographic performance, is great. It is.

Further, the solid processing agent preferably used in the present invention falls within the scope of the present invention in that only one part of a certain processing agent is solidified, but preferably all the components of the processing agent are solidified. It is that you are. Preferably, each component is molded as a separate solid processing agent and packaged identically.
It is also desirable that the separate components are packaged in the order in which they are periodically charged repeatedly.

In the present invention, the treating agent is preferably a solution prepared by dissolving a solid treating agent in water.

[0086]

Embodiments of the present invention will be described below. Naturally, the invention is not limited by the examples described below.

Example 1 (Preparation of silver iodide fine grain emulsion) <Solution A ₁ > Ossein gelatin 100 g KI 8.5 g Make up to 2000 ml with distilled water <Solution B ₁ > 360 g AgNO ₃ Make up 605 ml with distilled water <Solution C ₁ > KI 352 g Make up to 605 ml with distilled water Solution A ₁ was added to the reaction vessel, and the solution B ₁ and the solution C ₁ were added at a constant rate over 30 minutes by a simultaneous mixing method while stirring at 40 ° C. . The pAg during the addition was kept at 13.5 by a conventional pAg control means. The formed silver iodide has an average grain size of 0.
It was a mixture of β-AgI and γ-AgI of 06 μm.
This emulsion is called a silver iodide fine grain emulsion.

(Preparation of Solid Fine Particle Dispersion of Spectral Sensitizing Dye) The following spectral sensitizing dyes (A) and (B) were used in a ratio of 40:60.
, And stirred at 3500 rpm for 30 to 120 minutes with a high-speed stirrer (dissolver) to obtain a solid fine particle dispersion of the spectral sensitizing dye. At this time, the sensitizing dye (A) was adjusted to have a concentration of 2%.

[0089]

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(Preparation of seed emulsion Em-A) A hexagonal tabular seed emulsion Em-A having a silver iodide content of 2.0 mol% was prepared by the following method.
Was prepared.

[0091] <solution A _2> ossein gelatin 60.2g Distilled water _{20.0l HO- (CH 2 CH 2 O} ) n- [CH (CH 3) CH 2 O] 17 - (CH 2 CH 2 O) mH (n + m = 5~7) 10 % methanol solution _{5.6ml KBr 26.8g 10% H 2 SO} 4 144ml < solution B _2> to 3500ml with AgNO ₃ 1190 g of distilled water <solution C _2> KBr 823.2g KI 23 0.44 g Make up to 3500 ml with distilled water <Solution D ₂ > 1.75 N KBr aqueous solution At 35 ° C. below, at a temperature of 35 ° C., a solution B ₂ was added to solution A ₂ using a mixing stirrer described in JP-B-58-58288. Then, 64.1 ml of each of the solution C ₂ and the solution C ₂ were added to the double jet method in a time period of 2 minutes to form nuclei. After stopping the addition of the solution B ₂ and the solution C ₂ , it takes 60 minutes to raise the temperature of the solution A ₂ to 60 minutes.
The solution B ₂ and the solution C ₂ were added again at a flow rate of 68.5 ml / min for 50 minutes by the simultaneous mixing method. During this time the silver potential - using solution D ₂ a (saturated silver measured with a silver ion selection electrode as a comparative electrode silver chloride electrode) +6
It controlled so that it might be set to mV. After the completion of the addition, the pH was adjusted to 6 with 3% KOH, and immediately after desalting and washing, a seed emulsion Em-A was obtained. Seed emulsion Em-A thus prepared
Represents hexagonal tabular grains having a maximum adjacent side ratio of 1.0 to 2.0 in at least 90% of the total projected area of the silver halide grains, an average thickness of the hexagonal tabular pieces of 0.10 μm, and an average diameter (in terms of circular diameter).
It was found by electron microscope observation that the coefficient of variation was 0.4 μm and the coefficient of variation was 25%.

(Preparation of Emulsions Em-1 to Em-3) Using the following five kinds of solutions, tabular silver iodobromide emulsions Em-1 to Em-3 containing the amount of silver iodide shown in Table 1 were prepared. Prepared.

<Solution A ₃ > Ossein gelatin 29.4 g HO— (CH ₂ CH ₂ O) n- [CH (CH ₃ ) CH ₂ O] ₁₇ — (CH ₂ CH ₂ O) mH (n + m = 5) 7) 10% methanol solution 1.25 ml Seed emulsion Em-A 1.91 mol equivalent Equivalent to 3000 ml with distilled water <Solution B ₃ > 3.50 N AgNO ₃ aqueous solution 1400 ml <Solution C ₃ > KBr 576 g Distilled water to 1976 ml <Solution D ₃ > Silver iodide fine grain emulsion Amount adjusted to the silver iodide content shown in Table 1 <Solution E ₃ > 1.75 KBr aqueous solution The following potential control amount is shown in JP-B-58-58288 at 60 ° C. mixing stirrer using a solution a _3, solution B ₃ and solution C ₃ simultaneous mixing method the total amount of each 110ml and solution D ₃ of (triple jet method) by end flow rate at the start of the flow velocity of the addition of additives The addition and growth of the first coating layer were performed over a period of 40 minutes so as to double the thickness. Thereafter, the remaining coating solution B ₃ and solution C ₃ were coated by double jet method for 105 minutes so that the flow rate at the end of the addition was 1.5 times the flow rate at the start of the addition. Additive growth of the layer was performed.

[0094] During this time of the silver potential by using the solution E ₃ +20
It controlled so that it might be set to mV. After completion of the addition, precipitation and desalting were performed by the following method to remove excess salts.

1. The temperature of the reaction mixture after completion of mixing is raised to 40 ° C.
20 g / 1 mol of AgBr was added to the coagulated gelatin agent, and 56 w
Decrease the pH by adding t% acetic acid, allow to stand and decant.

1.8 l / AgBr1 of pure water at 40 ° C.
After adding mol and stirring for 10 minutes, the mixture is left standing and decanted.

3. The above step 2 is repeated once.

4. Thereafter, 15 g of gelatin / 1 mol of AgBr, sodium carbonate, and water are added to adjust the pH to 6.0, and the mixture is dispersed and finished to 450 cc / 1 mol of AgBr.

When about 1000 particles of Em-1 to 3 were observed and measured with an electron microscope, and analyzed for their shapes, they were tabular particles having an average equivalent circle diameter of 1.03 μm and a particle thickness of 0.15 μm. 24%, average aspect ratio is 7.
It was 0.

The average aspect ratios, equivalent circle diameters, and iodide values shown in Tables 1 and 3 were changed in the same manner as in Em-1 to 3 except that the amounts of silver nitrate, potassium bromide, silver iodide fine grain emulsion, and silver potential were changed. Silver halide emulsions Em-4 to Em-9 having a silver content were prepared.

(Preparation of Seed Emulsion Em-B) <Solution A ₄ > Ossein Gelatin 30 g KBr 1.25 g Nitric acid (0.1 N) 150 ml Distilled water Make up to 7,700 ml <Solution B ₄ > KBr 6 g KI 0.16 g distilled water to 740ml at <solution C _4> KBr 680g KI 20g distilled water to 2480ml with <solution D _4> to 740ml with silver nitrate 8.4g nitrate (0.1 N) 32 ml of distilled water <solution E _4> silver nitrate 991 0.6 g nitric acid (0.1N) 80 ml Make up to 2480 ml with distilled water To solution A ₄ stirred vigorously at 60 ° C., add solution B ₄ and solution D ₄
Was added by the double jet method over 10 minutes. Then, the solution C ₄ and the solution E ₄ are mixed by the double jet method to form
Added over 0 minutes. At this time, the initial addition flow rate was 1/8 of the final addition flow rate, and the sensitivity was linearly sensitized with time. During the addition of these solutions, pH = 2, pA
It was constantly adjusted to g = 8. After completion of the addition, the pH was raised to 6 with sodium carbonate, 150 g of KBr was added, and immediately after that, desalting and washing were carried out to obtain a monodisperse cubic silver iodobromide containing 2 mol% of silver iodide having an average grain size of 0.3 μm. Seed emulsion Em-B
I got According to electron microscopic observation, the twin generation rate was 1% or less in number.

(Preparation of Core / Shell Emulsion Em-C) A normal crystal emulsion Em-C containing 2.0 mol% AgI was prepared using the following five kinds of solutions.

[0103] <solution A _5> ossein gelatin _{75.5g HO- (CH 2 CH 2 O} ) n- [CH (CH 3) CH 2 O] 17 - (CH 2 CH 2 O) mH (n + m = 5. 7) 10% aqueous methanol 15ml seed emulsion Em-B 0.40 mole equivalent of distilled water to 4000 ml <solution B _5> added AgNO ₃ 46.2 g AgNO ₃ with an equimolar amount of ammonia solution and distilled water 259ml <Solution C ₅ > AgNO ₃ 647.6 g AgNO ₃ and an equimolar amount of ammonia solution and distilled water are added to make 1088 ml <Solution D ₅ > KBr 22.6 g KI 13.5 g Distilled water make 259 ml <solution E ₅ > KBr 453.3 g Make up to 1088 ml with distilled water Solution A ₅ was kept at 40 ° C. in a reaction vessel, and the pH was adjusted to 9.5 by further adding aqueous ammonia and acetic acid. After adjusting pAg to 7.3 with ammoniacal silver ion solution, pH and pAg were adjusted.
The solution B ₅ and the solution D ₅ were added by a double jet method while keeping the temperature constant to form a silver iodobromide layer containing 30 mol% of silver iodide. After adding 9.0 pH with acetic acid and KBr, the solution C ₅ and Solution E ₅ After preparing the pAg to 9.0 at the same time the growth was grown until it hits the 90% particle size. At this time, the pH was gradually lowered from 9.0 to 8.20. KB
The solution r was added to adjust the pAg to 11, and then the solution C ₅ and the solution E ₅ were further added to grow the solution while gradually lowering the pH to 8, thereby obtaining a silver iodobromide emulsion containing 2 mol% of silver iodide.

After completion of the addition, in order to remove excess salts,
Precipitation and desalting were carried out in the same manner as in Em-1, and a gelatin aqueous solution containing 92.2 g of ossein gelatin was added, and 2500 m
The resulting mixture was stirred and redispersed to obtain emulsion Em-C.

When about 1000 grains of the emulsion Em-C were observed and measured by an electron microscope and the shape was analyzed, monodispersed spherical grains having an average grain diameter of 0.51 μm and a distribution width of 12% were obtained.

Next, the obtained emulsion Em-C was subjected to spectral sensitization and chemical sensitization by the following methods.

After the emulsion was heated to 50 ° C., the solid fine particle dispersion was added so that the sensitizing dye (A) was 40 mg per mol of silver, and then ammonium thiocyanate was added to the emulsion at 4.0 mol per silver. × 10 ^-4 mol, and chloroauric acid 3.2
× 10 ^-6 mol and 3.4 × 10 ^-5 mol of sodium thiosulfate were added, and 40 minutes later, the silver iodide fine grain emulsion was added to ^1.10-6 mol.
After addition of 7 × 10 ⁻³ mol / Ag mol, 4-hydroxy-
6-methyl-1,3,3a, 7-tetrazaindene (T
AI) stabilized at 1.2 × 10 ^-2 mol.

Next, selenium sensitization was performed to obtain emulsion Em-1.
0, Em-11 and Em-12 were prepared as shown in Table 1. That is, the following selenium sensitizer was used together with ammonium thiocyanate, chloroauric acid, and sodium thiosulfate at 7.0 ×
Chemical sensitization was performed in the same manner as in the sensitization method except that 10 ^-6 mol was added, and selenium sensitization was performed.

[0109]

Embedded image

(Preparation of Sample) The following various additives were added to each of the obtained emulsions to prepare emulsions (photosensitive silver halide coating solutions). The amount of addition is shown in an amount per mole of silver halide.

T-butylcatechol 400 mg polyvinylpyrrolidone (molecular weight 10.000) 1.0 g styrene-maleic anhydride copolymer 2.5 g trimethylolpropane 10 g diethylene glycol 5 g nitrophenyl-triphenylphosphonium chloride 50 mg 1,3-dihydroxybenzene- sodium 4-sulfonic acid ammonium 4g 2-mercaptobenzimidazole indazole-5-sulfonic acid _{1.5mg n-C 4 H 9 OCH} 2 CH (OH) CH 2 n (CH 2 COOH) 2 1g

[0112]

Embedded image

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

(Coating Solution for Protective Layer) Matting agent comprising polymethyl methacrylate having an area average particle diameter of 7 μm 7 mg Colloidal silica (average particle diameter: 0.013 μm) 70 mg 2,4-dichloro-6-hydroxy-1,3,5 - triazine sodium salt _{30mg (CH 2 = CHSO 2 CH} 2) 2 O ( hardener) 36 mg

[0115]

Embedded image

The above coating solution was uniformly coated on both sides with an emulsion layer and a protective layer on a 175 μm-thick undercoated blue-colored polyethylene terephthalate film base, dried, and dried. It was created. The silver coating amount of the silver halide emulsion layer was 2.20 g per one side.
/ M ² .

(Preparation of Processing Agent) Preparation of Developing Tablet α (Hydroquinone Developing Agent) Preparation of Granulated Material (A) 3000 g of hydroquinone as a developing agent, 2000 boric acid
g and sodium sulfite (5,000 g) are each pulverized in a commercially available Bandham mill until the average particle size becomes 10 μm. To this fine powder, diethylenetriaminepentaacetic acid pentasodium (D
TPA · 5Na) 300 g, phenidone 500 g, N-
Acetyl-D, L-penicillamine 10 g, 5-nitrobenzotriazole 10 g, 1-phenyl-5-mercaptotetrazole 1.5 g, binder mannitol 1000
g for 30 minutes in a mill and granulation by adding 30 ml of water for about 10 minutes at room temperature in a commercially available stirred granulator. At 2
After drying for a time, the water content of the granules is almost completely removed.

Preparation of Granulated Material (B) 11000 g of potassium carbonate, 2000 of sodium bicarbonate
g and potassium iodide The amounts described in Table 3 and 1000 g of sodium glutaraldehyde bisulfite are each pulverized in a commercially available bantam mill until the average particle size becomes 10 μm. 1000 g of binder mannitol was added to this fine powder, mixed for 30 minutes in a mill, and then stirred for about 15 minutes at room temperature in a commercially available stirring granulator.
After granulation by adding 30 ml of water, the granules are dried at 55 ° C. for 2 hours in a fluidized bed drier to remove almost completely the water content of the granules.

Preparation of Solid Developer 100 g of sodium 1-octanesulfonate was added to the granules (A) and (B) thus obtained at 25 ° C.
The mixture was uniformly mixed for 10 minutes using a mixer in a room adjusted to a humidity of 40% or less, and the obtained mixture was subjected to a tableting machine modified from Typerest Collect 1527HU manufactured by Kikusui Seisakusho to reduce the filling amount per tablet. The tablet was compressed to 10 g and compression tableting was performed to prepare 1800 hydroquinone-based developers.

Preparation of Developing Tablet β (Developing Tablet Containing Reductones of the Present Invention) Preparation of Granulated Material (A) 500 g of phenidone, 10 g of N-acetyl-D, L-penicillamine, sodium glutaraldehyde bisulfite 1
000 g each in a commercially available bantam mill with an average particle size of 1
Grind to 0 μm. DTPA ・ 5N
a300 g, Dimason S300 g, sodium erythorbic acid (reductone compound of the present invention) 4000 g, sodium metabisulfite 1000 g, and binder sorbitol 500 g were added, mixed in a mill for 30 minutes, and mixed at room temperature in a commercial stirring granulator. After granulating by adding 30 ml of water for 10 minutes, the granulated material is subjected to 40 ° C. in a fluidized bed drier.
For 2 hours to remove the moisture of the granules almost completely.

Preparation of Granulated Material (B) 10300 g of potassium carbonate was ground in a commercially available bantam mill until the average particle size became 10 μm. 2000 g of binder mannitol and sorbitol 600
g of potassium iodide, 40 g of sodium 3- (5-mercaptotetrazol-1-yl) benzenesulfonate and 5-mercapto-
7 g of (1H) -tetrazolylacetic acid Na was added to the mixture, and
After mixing for 0 minutes and granulating in a commercial stirred granulator at room temperature for about 15 minutes by adding 30 ml of water, the granulated material is dried in a fluid bed dryer at 55 ° C. for 2 hours. The water in the granulated material is almost completely removed.

Preparation of Solid Developer Each of the granules (A) and (B) thus obtained is
-60 g and 160 g of sodium octanesulfonate were added, and 250 g of methyl-β-cyclodextrin was further added to the granulated product (B), and the mixture was mixed in a room conditioned at 25 ° C and RH of 40% or less using a mixer. After uniformly mixing the granulated mixture for 10 minutes, the obtained mixture was subjected to compression tableting with a tableting machine modified from Typerest Collect 1527HU manufactured by Kikusui Seisakusho to a filling amount per tablet of 10 g, and
Developed tablets of the present invention containing 650 tablets A from the granulated product (A) and 1300 tablets B from the granulated product (B) were prepared.

For each of the developed tablets, 17 tablets A and 30 tablets B were sealed and packaged in a pillow bag containing aluminum for moisture protection.

Next, a solid fixing agent was prepared in the following manner.

Preparation of Granulated Material (A) Ammonium thiosulfate / sodium thiosulfate (90/1
(0 weight ratio) 15,000 g, β-alanine 1500 g, and sodium acetate 3000 g are each pulverized in a commercially available bandam mill until the average particle size becomes 10 μm. 100 g of sodium sulfite and 1000 g of Na ₂ S ₂ O ₅ were added to this fine powder.
g, binder pine flow [Matsuya Chemical Industry Co., Ltd.] 10
Addition of 00 g and water addition amount to 50 ml, followed by stirring granulation, and drying of the granulated material at 40 ° C. with a fluidized-bed drier almost completely removes water from the granulated material.

Preparation of Granulated Material (B) 700 g of boric acid, 1500 g of aluminum sulfate and 1200 g of succinic acid are ground in the same manner as in (A). To this fine powder, tartaric acid (300 g) and binder mannitol (Kao Corporation) 30
0 g, sorbitol 100 g, and PEG # 4000 (polyethylene glycol molecular weight 4000) 150 g were added, and the amount of water added was 30 ml, and the mixture was stirred and granulated. The granulated product was dried at 40 ° C. using a fluidized bed drier to obtain a granulated product. Almost completely removes water.

Preparation of Solid Fixing Agent To each of the granules (A) and (B) thus obtained, 320 g and 40 g of sodium 1-octanesulfonate were added, and the mixture was conditioned at 25 ° C. and RH 40% or less. After uniformly mixing each granulated mixture for 10 minutes using a mixer in the room,
The obtained mixture was subjected to compression tableting using a tableting machine modified from Typerest Collect 1527HU manufactured by Kikusui Seisakusho with the filling amount per tablet being 10 g, and 2,000 tablets A were formed from the granulated product (A). From the granules (B), 400 tablets B were prepared as solid fixing agents.

At the start, the developer in the developing tank was 18 tablets per liter of water for the developing tablet α, and 3.3 liters of water for the pillow package (17 A agents and 30 B agents) for β. That is, 7.8 liters of a developing solution prepared at a rate of 9.09 per liter was supplied to an automatic developing machine SRX-201.
, And the following starter was added thereto to fill the developing tank as a starting solution, and processing was performed.

The amount of the starter added was 40 ml / 1 liter. In the case of the automatic developing machine SRX-101, the processing was started by filling the developing processing tank with 3.9 liters of the developing solution, and a starter was similarly added.

Developer Starter Composition KBr 3.5 g HO (CH ₂ ) ₂ S (CH ₂ ) ₂ S (CH ₂ ) ₂ OH 0.05 g N-acetyl-D, L penicillamine 0.10 g CH ₃ N (CH _{2 CH 2 CH 2 NHCONHCH 2 CH 2} SC 2 H 5) 2 0.05g sodium metabisulfite initiator solution finish 40ml fixing agent in an amount water to pH pillow packaging component (a agent 55, B agent 11) 3 Prepared by dissolving with 3 liters of water. 5.6 liters of the fixing solution prepared in this ratio was applied to an automatic developing machine SRX-20.
No. 1 was used as a start solution in the fixing processing tank. SRX-
In the case of No. 101, 1.9 liter was filled in the fixing processing tank.

In each of the developing and fixing steps, the one in which each packaging bag was opened by hand was set at the inlet of each solid processing agent, the tablets were dropped into the built-in chemical mixer, and at the same time hot water (25%) was added.
-30 ° C.) and dissolve with stirring for 25 minutes.
The solution was adjusted to 3.3 liters per minute. This was used as a developing replenisher and a fixing replenisher. The pH of the development replenisher was 10.55 for the hydroquinone type, and β for the developer containing the reductones of the present invention was 10.10. The pH of the fixing solution is 4.
70.

The built-in chemical mixer is divided into a liquid preparation tank and a spare tank tank. The capacity of the liquid preparation tank is 3.3 liters and the capacity of the spare tank is 3.3 liters. The replenisher was provided so that the replenisher was supplied so that the replenisher prepared in the above process would not be in a non-replenished state during the stirring and dissolution time (about 25 minutes).

The pH of the developer when the starter was added
Is 10.40 using the developed tablet α, and β is the developed tablet
Was 9.90.

In addition to the above solid processing agent, a developing solution γ prepared from the following concentrated solution kit was similarly added with the above starter to make a starting solution (starting pH 9.90), and a running process was performed.

The automatic developing machine sets SRX-201 at a developing temperature of 3.
It was modified so that it could be processed at 4 ° C., a fixing temperature of 34 ° C., and a drying temperature of 55 ° C. under the processing conditions (replenishment amount, processing time) shown in Table 1.

Also in the case of SRX-101, the developing temperature 34
It was modified so that it could be processed under the processing conditions (replenishment amount, processing time) shown in Table 1 at a fixing temperature of 34 ° C. and a fixing temperature of 34 ° C.

Preparation of developer γ Concentrate kit developer composition (for finishing 1 liter of developer) Part A Potassium iodide Listed in Table 3 Sodium ersorbate 40 g 4-Hydroxymethyl-4-methyl-1-phenyl-3- Pyrazolidone 1.0 g 50% potassium sulfite 170 g boric acid 20 g sodium bicarbonate 20 g potassium carbonate 100 g sodium 3- (5-mercaptotetrazol-1-yl) benzenesulfonate 0.40 g diethylene glycol 70 g 50% potassium hydroxide pH adjusted pure water To 550 ml and the pH was adjusted to 10.80.

Part B Acetic acid (90%) 22 g Triethylene glycol 10 g 1-Phenyl-3-pyrazolidone 3.0 g 5-Nitroindazole 0.03 g n-acetyl-D, L-penicillamine 0.2 g C part glutaraldehyde (50 %) 7.0 g Sodium bisulfite 8.0 g Pure water 20 ml Each of the developer A part, B part and C part is made up to a 3 liter amount as a developer and sealed in each integrated bottle for stock solution. The automatic developing machine has a built-in chemical mixer, and the unified bottle is automatically supplied with a stock solution to a liquid preparation section, and is finished to a predetermined volume (3 l) with water. The pH of the working solution is adjusted to 9.90 with KOH and acetic acid, respectively.

(Evaluation of variation in running process) The previously prepared film was cut into a large-sized film, and the entire surface was uniformly exposed so that the optical density after the development process became 1.0, and the running process was performed.

Running is SRX-201 per day.
And SRX-101 processed 10 sheets, and the first day (starting liquid state) and SRX-201 500 sheets (2
0 days), 1000 sheets (40 days), 1500 sheets (60 days)
Sun), 100 sheets (20 days), 200 sheets (40 days), and 500 sheets (60 days) after processing with SRX-101, the following sensitometry tests were performed to determine running fluctuations. Was.

(Sensitometry Test) Each of the obtained film samples was subjected to two kinds of fluorescent intensifying screens, namely, a comparative intensifying screen NR-160 (manufactured by Konica Corporation) and the yttrium tantalum oxide phosphor of the present invention. Sandwiching the intensifying screen Ultravision First Diet UVFD which is the main component,
X-rays were irradiated through an aluminum wedge at a tube voltage of 80 kVp and a tube current of 100 mA for 0.05 seconds, a sensitometric curve was created by a distance method, and the sensitivity and contrast were determined by a conventional method.

(Evaluation of Sensitivity and Contrast) Sensitivity is represented by the reciprocal of the exposure amount which gives a density of fog + 1.0.
o. The relative sensitivity is shown when the sensitivity when the fluorescent intensifying screen NR-160 of No. 1 is used is set to 100.

The contrast in the characteristic curve is as follows.
The gradient from the minimum density +0.25 to the minimum density +2.0 is represented as an average gradient (G).

(Evaluation of Sharpness and Granularity) For each fluorescent intensifying screen / photosensitive material combination for which sensitivity was evaluated, an X-ray source of 120 kVp (attached to a 3 mm-thick aluminum equivalent filter) was attached to a chest phantom manufactured by Kyoto Kagaku. Use, distance 1
A phantom was placed at a position of 40 cm, a scattering prevention grid having a grid ratio of 8: 1 was placed behind the phantom, and a photosensitive material and a fluorescent intensifying screen were placed behind the phantom, and photographing was performed.

In each of the photographs, the amount of X-ray exposure was adjusted by changing the exposure time so that the highest density part of the lung field was 1.8 ± 0.5. The obtained photographs were visually observed, and the graininess and sharpness were evaluated according to the following evaluation criteria.

Graininess evaluation criterion 5: Not very noticeable 4: Almost unnoticeable 3: Slightly conspicuous 2: Slightly obstructive interpretation 1: Slightly obstructive interpretation Sharpenness evaluation criterion 5: Very sharp 4: Good However, there is slight blur. 3: There is slight blur, but there is no problem in image interpretation. 2: The blur is conspicuous and there is a slight problem in image interpretation. 1: Difficult to read due to blur. The results obtained are summarized in Tables 1 to 4. Was.

[0147]

[Table 1]

[0148]

[Table 2]

[0149]

[Table 3]

[0150]

[Table 4]

From the results shown in Tables 1 to 4, it can be seen that with the constitution of the present invention, an image having high sensitivity, high sharpness, high contrast and good granularity can be obtained. It can also be seen that good photographic performance can be obtained in the running process in the first half.

[0152]

According to the present invention, when a silver halide photographic material is X-ray-exposed to a fluorescent intensifying screen containing a yttrium tantalate-based phosphor as a main component and processed with the developing solution of the present invention, high sensitivity is obtained. In addition, an image having high sharpness, high contrast, and good granularity was obtained, and an image forming method having excellent granularity and sharpness during long-term running processing was obtained.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G21K 4/00 G21K 4/00 B

Claims (3)

[Claims] 1. A support having at least one silver halide emulsion layer on one side thereof, wherein the silver halide grains in the emulsion layer have an average aspect ratio of 2 or more and a silver iodide content of 0.1.
5 mol% or more of a silver halide photographic light-sensitive material and a fluorescent intensifying screen mainly containing an yttrium tantalate-based phosphor are brought into close contact with each other and exposed to X-rays. 2. An image forming method, wherein an image is obtained by processing with a developer containing 2 mmol and reductones. 2. The image forming method according to claim 1, wherein said developer does not substantially contain dihydroxybenzenes. 3. The image forming method according to claim 1, wherein the developing solution is a developing solution prepared by dissolving a solid developer in water.