JPH07219099A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To provide a silver halide photographic sensitive material good in silver color tone and sharpness and graininess and superior in covering power. CONSTITUTION:The photosensitive material has >=2 silver halide emulsion layers comprising the upper silver iodobromide emulsion layer having an average silver iodide content of <=1.2mol% and the lower silver iodobromide emulsion layer having an average silver iodide content of >=1.4mol% and an average volume-average grain diameter of <=50% of that in the upper layer, and a coating silver amount of 15 to 100mol% of that of the upper layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver halide photographic light-sensitive material, and more particularly to a silver halide photographic light-sensitive material having a good silver tone, excellent sharpness, graininess and covering power.

[0002]

2. Description of the Related Art A light-sensitive material having a photosensitive emulsion layer on both sides of a support is one in which light incident from one side of the support is reflected at a layer interface, a layer / support interface, etc. when passing through the emulsion layer. Scattered light that has been refracted or reflected on the back surface of the support after passing through the emulsion layer again is reflected on the layer interface, layer / support interface, etc., and again enters the silver halide grains to be exposed to light, thereby sharpening the image. Remarkably deteriorates the sex. This is known as the "crossover effect".

Particularly in medical X-ray photography, a fluorescent intensifying screen having a light-emitting body serving as a light source is arranged on both sides of a support with a film having an emulsion layer interposed therebetween, and the X-ray is emitted by light from the light-emitting body. Since the image is formed, the presence or absence of the influence of the crossover light from the mutual surfaces greatly affects the quality of the image.

As a means for preventing these crossover lights, for example, in European Patent No. 84,637, a silver halide emulsion layer containing tabular grains is provided on the support side of a silver halide emulsion layer containing non-tabular grains. Is disclosed.

According to this technique, there is a problem that crossover light is reduced, sharpness is improved, but graininess is deteriorated, and the image has a yellowish silver color tone, especially in medical X-ray diagnostic photographs. It is not preferable.

There is also known a technique in which a silver halide emulsion layer which is not involved in sensitivity is provided between the support and the silver halide emulsion layer, but crossover light is reduced and maximum sensitivity is increased. On the other hand, there is a problem that the graininess is deteriorated. Further, the amount of silver attached increases, which is not preferable in terms of rapid processing, and the sharpness is not satisfactory.

Further, it is known that a filter dye is provided between the emulsion layer and the support in order to block crossover light. Generally, it is preferred that the filter dye is decolorized during the development processing and water-soluble. Since a dye is used, the dye diffuses into the emulsion layer and causes a decrease in sensitivity. It also causes rise in fog during storage.

British Patent 821,352 discloses a technique using a dye or a dye. However, in this method, the dye or the dye lowers the sensitivity, and the film after the treatment causes color contamination due to a dye residue or the like. It occurs and is not preferable for diagnosis.

Further, attempts have been made to provide an emulsion layer only on one side for high sharpness and to expose from only one side, but the sensitivity is low, and the photosensitive emulsion layer is inevitably required for high sensitivity. This results in an increase in the film thickness, resulting in a decrease in developability, fixability, water washability, drying property, and the like, which is not preferable because color stains, residual silver, residual hypo, and the like contaminate the image.

[0010]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a silver halide photographic light-sensitive material having a good silver color tone, excellent sharpness and graininess, and excellent covering power.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a silver halide photographic light-sensitive material having a silver halide emulsion layer consisting of at least two layers on at least one side of a support. Of the two arbitrary layers, the upper layer is a silver chloroiodobromide emulsion layer having an average silver iodide content of 1.2 mol% or less,
The lower layer is a silver iodobromide emulsion in which the average silver iodide content is 1.4 mol% or more, and the average volume grain size of the grains is 50% or less of the grains constituting the upper emulsion layer. The silver coating amount of the emulsion layer is 15 times the silver coating amount of the upper silver halide emulsion.
Achieved by a silver halide photographic light-sensitive material characterized by being ~ 100%.

The silver halide emulsion according to the present invention is obtained by preparing an emulsion having seed crystals and growing grains from the seed crystals, and may be obtained without using seed crystals.

As the emulsion according to the present invention, silver chloroiodide emulsion, silver iodobromide emulsion, silver chloride emulsion, silver chlorobromide emulsion, silver bromide emulsion, silver chloroiodobromide emulsion and the like can be used.

The silver halide grains in the emulsion used in the present invention may be any crystals such as cubic, octahedral, tetradecahedral, tabular having twin planes, spherical and jaguar potato-like crystals.
It may have a composite form of these crystal forms, and may consist of a mixture of particles of various crystals.

The emulsion used in the upper layer of the present invention includes
More preferably, the silver iodide content is 1.2 mol% to 0.8 mol%,
A tabular grain is preferably used as the grain shape, and a tabular grain having an aspect ratio of 3 or more and 8 or less is more preferable.

The most preferred embodiment of the layer structure of the present invention will be described below.

The coating amount of silver in the lower silver halide emulsion layer is 1.
It is 4 mol% or more, preferably 1.5 to 2.0 mol%.

The silver coating amount of the lower and upper silver halide emulsions is 15 to 100 mol% of the coating silver amount of the upper silver halide emulsion.
And preferably 20 to 80%. The average volume particle size of the lower layer particles is 50% or less of the particles constituting the upper emulsion layer, and preferably 30 to 40 mol%.

The emulsion used in the photographic light-sensitive material of the present invention is described in "Physics and Chemistry of Photography" by P. Glafkides "Chimie et.
physique photographique ”published by Paul Montel (1967
), "Photoemulsion Chemistry" by GF Daufin "Photographic
Published by Emulsion Chemistry ”Focal press (1966), V.
L. Zelikman et al. "Making and coating photographic emulsions""Making an
It can be prepared by the method described in dCoating photographic Emulsion ”Focal press (1964).

That is, any method such as neutral method, acidic method, ammonia method, etc. may be used, and the method of reacting the soluble silver salt with the soluble halogen salt may be a forward mixing method, a back mixing method, a double jet method, a controlled double method. It can be produced using mixing conditions such as a jet method, conversion methods, particle preparation conditions such as a core / shell method, and combinations thereof.

The emulsion of the present invention may be subjected to a water washing method such as a noodle water washing method or a flocculation sedimentation method in order to remove soluble salts. As a preferred washing method, for example, a method using an aromatic hydrocarbon aldehyde resin containing a sulfo group described in JP-B-35-16086, or a flocculating polymer agent described in JP-A-2-7037, eg G-3, A particularly preferable desalting method is a method using G-8 or the like.

The chemical sensitization method includes so-called sulfur sensitization,
Sensitization with selenium compounds, sensitization with tellurium compounds, gold sensitization, noble metals of Group VIII of the periodic table (eg Pd, Pt, Ir
And the like, and a combination of these sensitization methods can be used. Of these, a combination of gold sensitization and sulfur sensitization, or a combination of gold sensitization and selenium compound sensitization is preferable. Further, it is also preferable to use it in combination with reduction sensitization.

It is preferable to supply iodine ions at the time of chemical sensitization or at the time of completion, from the viewpoint of sensitivity and dye adsorption. In particular, the method of adding silver iodide in the form of fine particles is preferable.

It is also preferable to carry out the chemical sensitization in the presence of a compound having adsorptivity to silver halide. Particularly preferred compounds are azoles, diazoles, triazoles, tetrazoles, indazoles, thiazoles, pyrimidines, azaindenes, particularly compounds having a mercapto group and compounds having a benzene ring.

A reduction treatment of a silver halide photographic light-sensitive material, a so-called reduction sensitization method is a method of adding a reducing compound, a method called silver ripening, a method of allowing a silver ion excess state of pAg = 1 to 7 to pass, and a high pH ripening. The silver halide emulsion may be subjected to the so-called high pH condition of pH = 8-11. Further, these two or more methods can be used in combination.

The method of adding a reducing compound is preferable because the degree of reduction sensitization can be finely adjusted. The reducing compound may be an inorganic or organic compound, such as thiourea dioxide, stannous salt, amines and polyamines, hydrazine derivatives, formamidinesulfinic acid, silane compounds, borane compounds, ascorbic acid and its derivatives, sulfite. Examples thereof include salts, and particularly preferable examples include thiourea dioxide, stannous chloride and dimethylamine borane. The addition amount of these reducing compounds varies depending on the reducing property of the compound, the type of silver halide, the emulsion production conditions such as the dissolution conditions, and is 1 × 10 ⁻⁸ per mol of silver halide.
A range of up to 1 × 10 ^-2 mol is suitable. These reducing compounds are dissolved in water or an organic solvent such as alcohols and added during the growth of silver halide grains.

The silver halide photographic light-sensitive material is spectrally sensitized with a known spectral sensitizing dye. The dyes used are cyanine dyes, merocyanine dyes, complex cyanine dyes,
Included are complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes and hemioxonol dyes. Particularly useful dyes are those belonging to the cyanine dyes, merocyanine dyes and complex merocyanine dyes.

The sensitizing dye is used in the same concentration as that used in a normal negative type silver halide emulsion. In particular, it is advantageous to use a dye concentration that does not substantially reduce the intrinsic sensitivity of the silver halide emulsion. The sensitizing dye is preferably about 1.0 × 10 ^-5 mol to about 5 × 10 ^-4 mol per mol of silver halide, and more preferably about 4 × 10 ^-5 sensitizing dye per mol of silver halide.
It is preferably used in a concentration of 2 to ^10-4 mol. The silver halide emulsion used in the present invention includes a color image-forming coupler, that is, an oxidation product of an aromatic amine (usually primary amine) developing agent, particularly a compound which reacts to form a dye (hereinafter abbreviated as coupler). ) May be included.

The coupler is preferably a non-diffusible coupler having a hydrophobic group called a ballast group in the molecule.

The coupler may be either 4-equivalent or 2-equivalent with respect to silver ions. Further, it may contain a colored coupler having a color correction effect, or a coupler (so-called DIR coupler) which releases a development inhibitor upon development.

The coupler may be such that the product of the coupling reaction is colorless. As the yellow coupler, various open chain ketomethylene type couplers can be used. Among these, benzoylacetanilide compounds and pivaloylacetanilide compounds are used.

As the magenta coupler, a pyrazolone compound, an indazolone compound, a cyanoacetyl compound or the like can be used.

As the cyan coupler, a phenol compound, a naphthol compound or the like can be used.

The protective layer of the silver halide emulsion according to the present invention is a layer composed of a hydrophilic colloid layer, and as the hydrophilic colloid used, those mentioned above are used. Further, the protective layer may be a single layer or multiple layers.

A matting agent and / or a leveling agent may be added to the emulsion layer or protective layer of the silver halide photographic light-sensitive material of the present invention, preferably to the protective layer.

As an example of the matting agent, polymethylmethacrylate having an appropriate particle size (particle size of 0.3 to 5 μm, or preferably 2 times or more, more preferably 4 times or more the thickness of the protective layer) is used. An organic compound such as a water-dispersible vinyl polymer, or an inorganic compound such as silver halide or strontium barium sulfate is preferably used. Similar to the matting agent, the leveling agent is useful for preventing adhesion failure, and is particularly effective for improving the frictional characteristics related to the camera suitability during shooting or projection of motion picture film. As a specific example, liquid paraffin is used. , Waxes such as esters of higher fatty acids, polyfluorinated hydrocarbons or their derivatives, polyalkylpolysiloxanes, polyarylpolysiloxanes, polyalkylarylpolysiloxanes, or silicones such as their alkylene oxide addition derivatives. Is preferably used.

The silver halide photographic light-sensitive material obtained by the present invention may be optionally provided with an antihalation layer, an intermediate layer, a filter layer and the like.

In the silver halide photographic light-sensitive material of the present invention, various hydrophilic colloids can be used as a binder.

As the colloid used for this purpose,
Examples thereof include hydrophilic colloids generally used in the photographic field, such as gelatin, colloidal albumin, polysaccharides, cellulose derivatives, synthetic resins, polyvinyl compounds including polyvinyl alcohol derivatives, acrylamide polymers and the like. A hydrophilic colloid, for example, a dispersed polymerized vinyl compound, which particularly enhances the dimensional stability of the silver halide photographic light-sensitive material, can be contained. Suitable compounds of this type include water-insoluble monomers made by polymerizing vinylic monomers such as alkyl acrylates or alkyl methacrylates, acrylic acid, sulfoacrylates, or sulfoalkyl methacrylates.

In the production method of the present invention, the pH of the coating solution is
Is preferably in the range of 5.8 to 7.5. In the case of multi-layer coating, the pH of the coating liquid prepared by mixing the coating liquids of the respective layers in the ratio of the coating layer is preferably in the range of 5.8 to 7.5 described above. It is known that when the pH is less than 5.8, the dura mater proceeds slowly, which is not preferable, and when the pH is more than 7.5, the photographic performance is adversely affected.

The emulsion according to the present invention can use various photographic additives in the steps before and after physical ripening or chemical ripening. Known additives include, for example, RD No.17643
(December 1978), No.18716 (November 1979) and No.3
The compounds described in 08119 (December 1989) are mentioned. The types of compounds and the places where they are described in these three Research Disclosures are listed below.

Additive RD-17643 RD-18716 RD-308119 Page Classification Page Classification Page Classification Chemical sensitizer 23 III 648 Upper right 996 III Sensitizing dye 23 IV 648-649 996-8 IVA Desensitizing dye 23 IV 998 IVB Dye 25-26 VIII 649-650 1003 VIII Development accelerator 29 XXI 648 Upper right fog inhibitor / stabilizer 24 IV 649 Upper right 1006-7 VI Whitening agent 24 V 998 V Surfactant 26-7 XI 650 Right 1005-6 XI Antistatic agent 27 XII 650 Right 1006 to 7 XIII Plasticizer 27 XII 650 Right 1006 XII Sliding agent 27 XII Matting agent 28 XVI 650 Right 1008 to 9 XVI Binder 26 XXII 1003 to 4 IX Support 28 XVII 1009 XVII According to the present invention Examples of the support that can be used in the light-sensitive material include the above-mentioned RD-17643, page 28 and RD-308119, 100.
Examples include those described on page 9. A suitable support is polyethylene terephthalate film,
An undercoat layer may be provided on the surface of these supports in order to improve the adhesion of the coating layer, or corona discharge or ultraviolet irradiation may be applied.

The silver halide photographic light-sensitive material to which the present invention can be applied includes, for example, X-ray light-sensitive materials, lith light-sensitive materials,
Examples thereof include a black-and-white photographic light-sensitive material, a color negative light-sensitive material, and other light-sensitive materials that require high sensitivity or high contrast.

When the present invention is applied to medical X-ray diagnostic photographs, for example, the emulsion of the present invention is applied to a fluorescent intensifying screen whose main component is a phosphor which emits near-ultraviolet light or visible light by exposure to penetrating radiation. The photosensitive material surfaces coated on both sides are closely contacted and exposed.

The penetrating radiation referred to here is an electromagnetic wave of high energy and means X-rays and gamma rays.

The fluorescent intensifying screen refers to, for example, an intensifying screen mainly containing calcium tungstate as a fluorescent component or a fluorescent intensifying screen mainly containing a rare earth compound activated by terbium.

As the fluorescent intensifying screen, it is possible to use a fluorescent component uniformly coated on a support or a columnar or conical coating. '92 RSNA (American Society of Radiological Sciences) session, especially when using low sensitive photosensitive materials
German Karman Karlsruhe Nuclear Res presented at 868
Like the erch's microstructured intensifying screen, increase the thickness of the fluorescent component and apply it in a conical shape to increase the sensitivity of the intensifying screen and at the same time reduce the quantum mottle and use a fluorescent intensifying screen with better graininess. It is preferable.

For the photographic processing of the silver halide photographic light-sensitive material according to the present invention, for example, Research Disclosure No. 176, pp. 28-30 (RD-1764).
Any of various methods as described in 3) and various processing solutions can be applied.

For example, the developing solution used for black and white photographic processing may contain a developing agent. As the developing agent, dihydroxybenzenes (for example, hydroquinone), 3-pyrazolidones (for example, 1-phenyl-3-pyrazolidone), aminophenols (for example, N-methyl-o-aminophenol), etc. are used alone or in combination. be able to.

For the photographic processing of the silver halide photographic light-sensitive material of the present invention, the processing can be carried out with a developing solution containing imidazoles as a silver halide solvent described in JP-A-57-78535. Further, it can be processed with a developing solution containing a silver halide solvent and an additive such as indazole or triazole described in JP-A-58-37643. The developer generally contains various other preservatives, alkali agents, pH buffers, antifoggants, etc., and further contains a solubilizing agent, a color toning agent, a development accelerator, a surfactant, a defoaming agent, if necessary. A water softener, a film hardening agent, a viscosity imparting agent and the like may be contained.

As the fixing liquid, those having a generally used composition can be used. As the fixing agent, in addition to thiosulfates and thiocyanates, organic sulfur compounds known to be effective as a fixing agent can be used.

The fixing solution may contain a water-soluble aluminum salt as a hardening agent.

[0053]

EXAMPLES Examples of the present invention will be described below. However, as a matter of course, the present invention is not limited to the examples described below.

Example 1 <Preparation of silver halide emulsion> A silver iodobromide emulsion was prepared in which 1.4 mol% of silver iodide and 98.6 mol% of the rest were silver bromide. This emulsion has an average grain size of 1.91 μm and an average grain thickness of 0.3.
At 4 μm, the particle size dispersibility was 0.23 in terms of coefficient of variation (according to the method described in JP-A-60-162244). The obtained emulsion was designated as (A).

Separately, a silver iodobromide emulsion containing 1.0 mol% of silver iodide and 99.0 mol% of the remaining silver bromide was prepared. This emulsion had an average grain size of 1.85 μm, an average grain thickness of 0.36 μm, and a grain size dispersibility of 0.22 in terms of variation coefficient. The obtained emulsion was designated as (B).

Further, a silver iodobromide emulsion containing 1.2 mol% of silver iodide and the remaining 98.8 mol% of silver bromide was prepared. This emulsion was an octahedron having an average grain size of 0.44 μm, and the dispersibility of grain size was 0.17 in terms of variation coefficient. The obtained emulsion was designated as (C).

Separately, a silver iodobromide emulsion was prepared in which silver iodide was 1.5 mol% and the remaining 98.5 mol% was silver bromide.

This emulsion was an octahedron having an average grain size of 0.45 μm, and the grain size dispersibility was 0.16 in terms of variation coefficient. The obtained emulsion was designated as (D).

Similarly, a silver iodobromide emulsion in which silver iodide is 1.5 mol% and the remaining 98.5 mol% is silver bromide and has an average grain size of 0.60
Emulsions of octahedral grains of μm and 1.05 μm were designated as emulsions (E) and (F), respectively. The coefficient of variation of particle size is 0.16
Met.

<Preparation of sample> Obtained emulsion (A),
The following sensitizing dyes (X) and (Y) were added to (B), (C), (D), and (E) at 55 ° C. in a weight ratio of 20: 1 per mol of silver halide (A). ), (B) 500m each
g, 975 mg to (C), 600 mg to (D), and 390 mg to (E).

Sensitizing dye (X); 5,5'-dichloro-9-ethyl-3,3'-di- (3-sulfopropyl) .oxacarbocyanine-sodium salt anhydride Sensitizing dye (Y ); 5,5'-Di- (butoxycarbonyl) .1,
1'-diethyl-3,3'-di- (4-sulfobutyl) .benzimidazolocarbocyanine-sodium salt anhydride 10 minutes later, add appropriate amount of chloroauric acid, sodium thiosulfate, ammonium thiocyanate Chemically aged. 15 minutes before the end of ripening, 200 mg of potassium iodide was added per mol of silver halide, and then 4-hydroxy-6-methyl 1,3,3a, 7
-Tetrazaindene 3 x 10 per mol of silver halide
^-2 mol was added and dispersed in an aqueous solution containing 70 g of gelatin.

Then, emulsions (B) and (D) were mixed at a molar ratio of silver halide of 3:10 to prepare emulsion (F).
And

These emulsions (A), (B), (C),
JP-A-2-3017 for each of (D), (E), and (F)
No. 44, p. 95, line 16 to p. 96, line 20, the additives were added.

Further, 1.2 g of the dye emulsion dispersion shown below was added to prepare an emulsion coating solution.

Preparation Method of Dye Emulsion Dispersion 10 kg of the following dye was dissolved in a solvent consisting of 28 liters of tricresylphosphite and 85 liters of ethyl acetate at 55 ° C.
This is called an oil-based solvent. On the other hand, a 9.3% gelatin aqueous solution containing 1.35 kg of an anionic surfactant (AS) is called an aqueous solvent.

Next, the oil-based solvent and the water-based solvent were placed in a dispersion pot and dispersed while keeping the liquid temperature at 40 ° C.

[0067]

[Chemical 1]

The additives used for the protective layer are as follows. The added amount is shown as an amount per 1 liter of the coating liquid.

Coating liquid for protective layer Lime-treated inert gelatin 68 g Acid-treated gelatin 2 g Polymethylmethacrylate (matting agent having an area average particle size of 6.0 μm) 1.1 g Silicon dioxide particles (matting agent having an area average particle size of 3.0 μm) 0.5 g Glyoxal 40% aqueous solution (hardener) 1.5 ml (CH ₂ = CHSO ₂ CH ₂ ) ₂ O (hardener) 500 mg C ₁₁ H ₂₃ CONH (CH ₂ CH ₂ O) ₅ H 2.0 g

[0070]

[Chemical 2]

The emulsion layer has a silver conversion value of 2.0 g per side.
/ M ² , the protective layer gelatin coating amount is 0.99 g / m ² , and the lower emulsion layer, the upper emulsion layer and the surface protective layer are simultaneously extruded by a coating method at a speed of 90 m / min, glycidyl methacrylate, methyl acrylate, Concentration of butyl methacrylate copolymer (50: 10: 40wt%) is 10wt%
On the 175 μm polyethylene terephthalate base coated with the copolymer aqueous dispersion obtained by diluting as described above, an emulsion layer and a protective layer were simultaneously coated on both sides and dried for 2 minutes and 15 seconds.

The amount of gelatin in the emulsion layer was 2.0 g / m ^2.
It was prepared so that it could be applied by.

<Sensitometry> Each of the obtained sample films was used as a standard light source B described in "New Edition, Lighting Data Book", The Illuminating Society of Japan, and the exposure time was 0.1.
Second, 3.2 cms, non-filtering so that both sides have the same amount of light, then the automatic processor SRX-502 (Konica Corporation)
(Manufactured by K.K.) was used as the developing solution and the fixing solution, and the processing was carried out at a developing temperature of 35 ° C. and a fixing temperature of 33 ° C.

The following starter solution was added to the developing layer at the start of development at a rate of 20 ml per liter of developing solution.

The replenishing amount of the developing solution was 300 ml per 1 m ^{2 of the} silver halide photographic light-sensitive material, and the replenishing amount of the fixing solution was 400 ml and the processing was conducted.

As washing water, 3.0 liters of water at 20 ° C. was supplied per minute, and the drying temperature was 45 ° C.

The sensitivity and covering power (CP) of each sample thus obtained were determined.

The sensitivity was determined by the reciprocal of the amount of light required to increase the blackening density by 1.0, and was shown as the relative sensitivity when the sensitivity of comparative sample No. 1 was 100.

Further, the covering power is indicated by a value obtained by dividing the maximum density by the amount of silver per unit area. The results are shown in Tables 1 and 2.

Developer formulation (38 liter finish) Part (A) solution Potassium hydroxide 950 g Potassium sulfite 2450 g Sodium hydrogen carbonate 380 g Boric acid 38 g Hydroquinone 1050 g Diethylenetriamine pentaacetic acid 5 sodium 60 g 5-Methylbenzotriazole 5.5 g Pure water is added 9.5 Part (B) solution to make liters Acetic acid (90%) 600 g Triethylene glycol 500 g 1-Phenyl-3-pyrazolidone 50 g 5-Nitroindazole 1.5 g Preparation of developer Add 20 liters of water at 25 ° C to a 50 liter tank, The above-mentioned Part (A) solution was added while stirring, then Part (B) solution was added and water was added to make 38 liters. This developing solution is left at 25 ° C for 24 hours, then it is washed with potassium hydroxide and acetic acid.
The pH at ° C was adjusted to 10.40.

Starter liquid (1 liter finish) Glacial acetic acid 210 g Potassium bromide 200 g Fixer formulation to add 1 liter by adding pure water (38 liter finish) Part (a) Ammonium thiosulfate 6000 g Ethylenediaminetetraacetic acid disodium dihydrate 0.8 g Sodium sulfite 460 g Boric acid 270 g Sodium hydroxide 190 g Glacial acetic acid 350 g Add pure water to make 9.5 liters Part (b) Aluminum sulfate (anhydrous salt equivalent) 380 g Sulfuric acid (50 wt%) 230 g Add pure water to make 1.9 liters Fixing Preparation of Solution 20 liters of water at 25 ° C. was placed in a 50 liter tank, the above-mentioned Part (a) solution and Part (b) solution were sequentially added, and water and acetic acid were added to make 38 liters.

The pH of this fixing solution at 25 ° C. was adjusted to 4.35.

<Evaluation of Sharpness> The sharpness of each sample film was measured by using Funk Test Chart SMS5853 (sold by Konica Medical Co., Ltd.) with a fluorescent intensifying screen SRO-250 (manufactured by Konica Co., Ltd.). Exposure (exposure amount was measured according to the Funk test chart) Each sample film that was exposed so that the average density of the light and shade was 0.8 ± 0.02 was processed under the above processing conditions. The sample film was processed with a color temperature of 7700 Kelvin and an illuminance of 11600 lux. Tables 1 and 2 show the results of the above-described observation with transmitted light and the following five-stage evaluation.

<Evaluation Criteria> A: Loupe can be identified up to 10 LP / mm B: Loupe can be identified up to 8 LP / mm C: Loupe can be identified up to 6 LP / mm D: Loupe can be identified up to 5 lp / mm E: Loupe Up to 4LP / mm can be identified with <Evaluation of graininess and silver tone> Fluorescently sensitized sample SRO-250
(Konica Corp.), a chest phantom was photographed at a tube voltage of 80KVP, and the sample film treated with the same developer as above was compared by transmitted light on a light source stand with a color temperature of 7700 Kelvin and an illuminance of 11600 Lux. The results evaluated according to the following evaluation criteria are shown in Tables 1 and 2.

Similarly, the silver tone was evaluated according to the following evaluation criteria, and the results are shown in Tables 1 and 2.

Graininess Evaluation Criteria A: Very Good B: Good C: Normal D: Slightly Inferior E: Poor (Evaluation Criteria for Silver Tone) A: Pure Black Tone Not At All B: B: Partial There is a slight yellowishness C: A slight yellowishness is felt on the entire surface D: Yellowishness is felt at a glance

[0087]

[Table 1]

[0088]

[Table 2]

As is clear from Tables 1 and 2, the silver halide photographic light-sensitive material of the present invention is a silver halide photographic light-sensitive material excellent in sensitivity, graininess and silver tone.

[0090]

According to the present invention, a silver halide photographic light-sensitive material excellent in sharpness, graininess, silver tone and covering power can be obtained.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuji Hasegawa 1st Sakura-cho, Hino City, Tokyo Konica Stock Company In-house

Claims (1)

[Claims] 1. A silver halide photographic light-sensitive material having a silver halide emulsion layer consisting of at least two layers on at least one side of a support, wherein any 2 of the emulsion layers is used.
Among the layers, the upper layer is a silver chloroiodobromide emulsion layer having an average silver iodide content of 1.2 mol% or less, and the lower layer has an average silver iodide content of 1.
A silver iodobromide emulsion having an average volume grain size of 4 mol% or more and 50% or less of the grains constituting the upper emulsion layer, and the coating silver amount of the lower silver halide emulsion layer is the same as that of the upper layer. A silver halide photographic light-sensitive material characterized by being 15 to 100% of the coated silver amount of a silver halide emulsion.