JP3390951B2 - Silver halide emulsion and photographic light-sensitive material using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver halide (hereinafter referred to as "AgX") emulsion useful in the field of photography, and particularly to an AgX emulsion containing tabular grains having {100} faces as major faces. Regarding

[0002]

2. Description of the Related Art When tabular AgX emulsion grains are used in a photographic light-sensitive material, color sensitization, sharpness, light scattering characteristics, covering power, development progress and graininess are improved as compared with non-tabular AgX grains. It For this reason, tabular grains having twin planes parallel to each other and having a {111} plane as a main plane have been frequently used. However, when a large amount of the sensitizing dye is adsorbed on the AgX grains, the grains having {100} faces generally have better color sensitizing properties. Therefore, the main plane is {10
Development of tabular grains having a 0} plane is desired. The {100} tabular grains whose main plane shape is a right-angled parallelogram are disclosed in JP-A-51-88017, JP-B-64-8323, EP-A-0,534,395A1 and US-A-5,29.
2,632, 5,264,337, 5,32
0,938, JP-A-5-313273, 6-59.
It is described in 360 and WO94 / 22051. Among them, U.S. Pat. No. 5,320,938, JP-A-5-3
13273, 6-59360, WO94 / 220
No. 51, there is an example of using a fine grain emulsion for grain growth, but US Pat. No. 5,320,938, and WO94 / 220.
No. 51 does not clearly specify the particle size, and JP-A-5-313273 and 6-59360 specify that small particles are preferable, and the volume of the erasable particles is 70 to 100%. This is different from the emulsion of the present invention in which the growth is performed on grains having Also, US Pat. No. 5,32
No. 0,938, European Patent No. 0,534,395A1, etc. do not describe that the growth temperature is particularly preferably 65 ° C. or higher, and at the same time, it is not specified that the generation of new nuclei is required. It is different from the present invention in No. 539360, which clearly specifies that solution addition at a flow rate at which new nuclei are not generated is preferable. Further, in any of the patents, it is not described that monodispersed pure silver chloride grains prepared in advance or silver halide grains having a Cl content of 10% or more are used as seed crystals for monodispersion of grains. Different from the invention.

[0003]

DISCLOSURE OF THE INVENTION The object of the present invention is that the anisotropic growth property is good, the growth speed in the thickness direction is very slow, the monodispersity of grains is more excellent, and the sensitivity, graininess, and spectral sensitization properties are improved. To provide a more excellent AgX emulsion and a photographic light-sensitive material using the same.

[0004]

The objects of the present invention have been achieved by the following items. (1) In a silver halide emulsion having at least a dispersion medium and silver halide grains, 30% or more of the total projected area of the silver halide grains has a {100} plane as a main plane and an aspect ratio (diameter / thickness). ) Is 1.5 or more and the content of Cl is 20% or more, and the addition of fine particles containing 90% or more of silver halide fine particles capable of eliminating the growth of the silver halide grains, and Silver halide emulsion, wherein 50% or more of the total number of added fine particles are fine particles having a volume of 70% to 100% of the maximum fine grain volume that can be eliminated by growth. ( 2 ) When the added fine particles are counted in descending order of volume, 70% or more of the total number of the added fine particles is a fine particle having a volume of 70% to 100% of the maximum fine particle volume that can be lost by growth. The silver halide emulsion according to (1) above . ( 3 ) The silver halide emulsion as described in (1) or (2), wherein the tabular grains after grain formation have a Cl content of 40% or more. ( 4 ) A silver halide photographic light-sensitive material comprising at least one of the emulsions described in any one of (1) to ( 3 ) on both sides of a support. ( 5 ) 40 % of the light-sensitive material for silver halide radiation described in (4)
An image forming method characterized by being used in combination with a fluorescent intensifying screen which emits light by X-ray exposure having a peak at 0 nm or less
Law .

The projected area of the tabular grains is the projected area of the grains when the tabular grains are arranged on the substrate in a state where the AgX emulsion grains do not overlap each other and the main plane is parallel to the substrate surface. Refers to. The equivalent circle diameter of the tabular grains means the diameter of a circle having an area equal to the projected area of the grains when the grains are observed with an electron microscope. The thickness refers to the distance between the main planes of tabular grains. The aspect ratio is a value obtained by dividing the equivalent circle diameter (diameter) of the tabular grains by the thickness. The thickness is preferably 0.5 μm or less, and 0.03 to
0.3 μm is more preferable, and 0.05 to 0.2 μm is still more preferable. The projected equivalent grain diameter of the tabular grains is 10 μm
The following is preferable, and 0.2 to 5 μm is more preferable. The circle equivalent diameter distribution is preferably monodisperse, and the coefficient of variation of the distribution is preferably 0 to 0.4, more preferably 0 to 0.3, still more preferably 0 to 0.2. Here, the coefficient of variation is
It is represented by a value obtained by dividing the variation (standard deviation) of the grain size represented by the circle equivalent diameter of the projected area of the grain by the average grain size. Further, the shape of the main plane of the tabular grains is a right-angled parallelogram, and the ratio of adjacent sides [(long side length / short side length) of one grain] is 1 to 10, preferably 1. ~ 5, more preferably the embodiment of 1-2.

The AgX emulsion of the present invention is an AgX emulsion having at least a dispersion medium and AgX grains, and is 30% or more, preferably 60 to 100, of the total projected area of the AgX grains.
%, More preferably 80 to 100%, the main plane is {10
0} plane, and tabular grains having an aspect ratio of 1.5 or more, more preferably 3 to 25, and further preferably 3 to 10.

In order to form the tabular grains, it is necessary that crystal defects such as screw dislocations are incorporated at the time of nucleation to promote growth in a specific direction. Although the crystal defects have not been determined to be screw dislocations, they are considered to be highly likely to be screw dislocations because they give anisotropic growth properties to the direction in which the dislocations are introduced and the grains.

The preferred range of the AgX composition of the tabular grains of the present invention is that Cl is preferably 20% or more.
0% or more is more preferable, and 90% or more is particularly preferable.

Grain growth in this patent refers to all the steps since the amount of silver was added in an amount of 30% or more of the total amount of silver, and a clear halogen gap or the like was observed between nucleation, ripening and growth. It does not have to exist.

The silver halide grains of the present invention have anisotropic growth.
The feature is that AgX fine particles capable of eliminating growth are used.
It is preferable that the added fine particles have a Cl content of 50% or more.
More preferably 70% or more, more preferably 90% or more
It is particularly preferable that there is. Tabular grains do not maintain anisotropic growth
For tabular growth, the tabular grains themselves must not dissolve.
It is essential to grow under such conditions and at low supersaturation.
is there. Therefore, the added fine particles disappear by the end of particle formation.
The largest possible particle (hereinafter referred to as "critical particle")
Is preferably added. Because the addition of fine particles
Since the supersaturation of the method is determined by the solubility of the particles, the particle size
The larger the size, the lower supersaturation can be achieved, and the finer particles
Because it exists, dissolution of the tabular grain itself does not occur
Is. Therefore, the added fine particles are preferably all particles.
90% or more, more preferably 95% or more, particularly preferably
Is 100% or less of the critical fine particles and less than or equal to the critical fine particles.
It is preferable to use particles having a volume of 70% to 100%,
It is more preferable to use 80-100% of the volume of particles.
It is particularly preferable to use 90 to 100% by volume of particles.
Good In addition, the above-mentioned fine particles are ordered in descending order of volume.
It is preferable to occupy 50% or more of all the fine particles,
It is more preferable to occupy 70% or more, and 85% or more
Is particularly preferable. The size of the critical particles is {10
0} increases as the size of tabular grains increases
Therefore, it is necessary to gradually increase the added fine particles during growth.
There is. Also, the size of the fine particles that disappear is AgX fine particles.
Halogen composition, pH, pAg, gelatin temperature, AgX
It changes depending on the solvent concentration. Therefore, the critical particle size
Decisions must be made at various times during growth
No The critical particle size is determined by knowing the size
Known size of {100} tabular grains prepared in advance
Particles with a coefficient of variation of about 0.1
Repeat the method of adding and growing, and try and
You can decide with Ra. During the growth of the fine grain emulsion
It is preferable to add it, but it is preferable
Is 5% or more, more preferably 10% or more of the fine particles.
The emulsion of the present invention can be obtained by using grains. The fine particle milk
The agent can be added continuously or intermittently.
You can also do it. The fine grain emulsion is provided near the reaction container
AgNO with a mixer₃Solution and X ^-Continuous supply of salt solution
Prepared and added continuously to the reaction vessel immediately
Alternatively, it can be prepared in batch in advance in another container and then
It can also be added continuously or intermittently. The fine particles
The emulsion can be added in liquid form, or as a dry powder.
It can also be added. In addition, the size of the fine particles
Direct method low temperature transmission electron microscope (hereinafter referred to as “Direct TE
Particles are photographed and measured. The fine particles are
Since it is often a cubic particle, it can be directly used for TEM measurement.
More usually, the volume of particles can be determined. The fine particles
If it is not a cubic particle, check the crystal wall of the particle before applying.
Appropriate measurement methods must be used. The fine particles are multiple twin grains
It is preferably substantially free of offspring. Multiple twin here
A grain is a grain having two or more twin planes per grain.
Refers to. The term "substantially free from" means that the twin twin grain number ratio is
5% or less, preferably 1% or less, more preferably 0.1
% Or less. Furthermore, it does not substantially contain single twin grains.
It is preferable that Furthermore, it also substantially includes screw dislocations.
Preferably not. Here it is said that it is not substantially included
Follow the above rules. The halogen composition of the fine particles is AgCl,
AgBr, AgBrI (I^-The content is preferably 20 mol% or less
10 mol% or less is more preferable) and those 2
It is a mixed crystal of more than one species.

An example of the direct TEM method is shown below. 1. Sample preparation During the formation of grains and / or after the formation of grains, the emulsion was treated with a grain deformation inhibitor-1 or phenylmercaptotetrazole (1 × 10 ⁻³ to 1 × 10) so as not to cause grain deformation.
^-2 mol / mol Ag) in methanol solution,
The particles were taken out by centrifugation, dropped on a sample support (mesh) for observing an electron microscope having a carbon support film attached in advance, and dried to obtain a sample. 2. Observation of particles The sample prepared was used as an electron microscope JEM-20 manufactured by JEOL Ltd.
00FXII, acceleration voltage 200kV, magnification 5000 times ~
50,000 times, sample cooling holder 626 made by gatan
-Observation temperature using 0300 Cryostation-
Observation was performed at 120 ° C.

[0012]

[Chemical 1]

The maturation and / or growth of the grains depends on the pCl
1.6 or more, preferably pCl2.5 to 1.6, and 6
It is preferable to carry out under conditions of 5 ° C or higher, preferably 65 ° C to 80 ° C. Also in the case of grains having a halogen composition other than pure silver chloride, it is preferable to form the grains at the Cl ⁻ concentration. This is because it is preferable that the tabular grain formation is carried out under the cubic grain formation condition, and the Cl ^- concentration condition corresponds to the cubic grain formation condition. The excess Cl ⁻ can be regarded as a kind of crystal habit controlling agent.

The tabular grains are characterized by being grown by adding Ag ^- salt and halogen salt at an addition rate such that new nuclei are generated and the new nuclei do not grow to the critical fine particles. The new nucleus is
The number of grains is preferably 2 times or more, more preferably 5 times or more, and particularly preferably 10 times or more of the number of {100} tabular grains. Here, the generation of new nuclei is preferable because dissolution of tabular grains does not occur due to the generation of new nuclei and anisotropic growth of grains can be maintained. In addition, the decrease in supersaturation of the system due to the generation of new nuclei is also a factor for maintaining the anisotropic growth of particles. The generation of new nuclei, the number of new nuclei, and the fact that no particles larger than the critical particle size have been generated can be confirmed by the direct method TEM of the material without centrifuging at the time of preparing the material. The generation rate of the new nuclei and the addition rate at which the new nuclei do not grow up to the critical particle size are determined by the halogen composition added, p
H, pAg, gelatin type, gelatin concentration, temperature, AgX
It varies depending on the solvent concentration, the {100} tabular grain size, and the like. Therefore, it is necessary to determine by the trial and error method at various timings of growth. Generally, the addition rate satisfying the conditions can be realized in a wider range of the addition rate as the pCl value increases. Further, it is preferable that the generation of new nuclei preferably always occurs, but if the generation of new nuclei occurs only when the amount of grown silver is preferably 5% or more, more preferably 10% or more, The emulsion of the present invention can be used. However, also in this case, the nuclei formed by the new nuclei must always be present when the Ag salt is added.

The tabular grains have a volume variation coefficient of 0.2 or less.
And the volume of particles is 0.001 μm ³Pure silver chloride,
Alternatively, seed crystals of silver halide grains having a Cl content of 10% or more
Is used to form particles. The seed crystals are
It is preferable that the Cl content is 10% or more, and 30% or more.
Is more preferable, and 70% or more is particularly preferable.
Good The coefficient of variation and volume of seed crystals were measured by direct method TEM images.
Can be set. Further, the coefficient of variation of the volume of the seed crystal is 0.
It is preferably 2 or less, more preferably 0.15 or less.
Is more preferable, and 0.1 or less is particularly preferable. That
And the seed crystal volume is 0.001 μm³Is preferred to be
Fresh, 0.0005 μm³More preferably:
0.0003 μm³The following is particularly preferable.
Here, it is generally preferable to use monodisperse seed crystal particles.
When particles are formed using a usual Ag salt and halogen salt,
Reproducibility and monodispersity deteriorated with scale-up
I will end up. However, by using monodisperse seed crystals
It is possible to obtain monodisperse particles with good reproducibility even if they are upgraded.
Because. Grains of the tabular grains when seed crystals are used
The coefficient of variation after formation is preferably 0.25 or less,
0.20 or less is more preferable, and 0.15 or less
It is particularly preferable that there is. Small coefficient of variation for finished particles
By suppressing it, it is possible to obtain a high-sensitivity emulsion with a solid gradation.
By the way, the halogen gap required for grain formation is Br
^-Salt alone, and Br^-Simultaneous addition of salt and Ag salt, and Br
^-Salt and Cl^-Bringing salt mixture alone and Br^-Salt and C
l^-It is preferable to introduce it by simultaneously adding a mixture of salt and Ag salt.
Good It is also preferable to use yellow blood salt as an impurity.
Yes. At this time, the optimum halogen addition amount and impurity amount are seed crystals.
Since it depends on the particle surface area, an appropriate amount can be trianded.
It must be determined by the error method and added. This time halo
If the amount of gen and the amount of impurities are too small, flat plate nucleation will occur.
If too much, too many thick particles will be generated.
U

Next, the nucleation and aging of the grains will be described in detail. First, the nucleation process will be described in order. Forming a by reacting with first host silver halide nuclei AgX ₁ nucleus ^- (1) Nucleation at least a dispersion medium and Ag ⁺ and halide dispersion medium solution with water (X _1). Alternatively, monodispersed AgX ₁ fine particles are used as a seed crystal. Then different X ₂ ^- is added a solution or impurities (yellow prussiate, etc.), substantially forms a dislocation as the tabular grain formation caused. In order to form the dislocations of the present invention, the reaction condition must be a {100} plane forming atmosphere. Further, since the formation of dislocations present invention is usually slow, heterologous X ^- solution or doped after a predetermined time (preferably 3
Min or more, more preferably 7 min or more) It is necessary to keep the state as it is without adding new.

As the crystal habit controlling agent necessary for nucleation, in addition to the compounds described in European Patent 0,534,395A1, gelatin having a high methionine content (preferably 10) is used.
μmol / g or more, more preferably 30 to 200 μmo
1 / g), a known water-soluble dispersion medium for AgX emulsions (for general information, Research Disclosure, Volume 307, Item 307105, November 1989, can be referred to, especially JP-B-52-16365, JP-A-5
9-8604, Journal of Imaging Science, 31
Vol. 148 to 156 (1987) is more preferable).

The nucleation temperature is preferably 20 to 80 ° C.,
25-50 degreeC is more preferable. The smaller the size of the nucleus, the easier the ripening proceeds, and the more convenient it is to make thin particles. Therefore, it is preferable to perform nucleation at a low temperature. However, energy is required to form the dislocations of the present invention. To satisfy both, A
The formation of gX nuclei is kept at a low temperature, preferably 2 ° C. at the time of dislocation formation.
Above, it is more preferable to raise the temperature by 5 to 30 ° C.

In the formation of the {100} tabular grains of the present invention, it is preferable to supply silver halide fine grains necessary for ripening before ripening. The halogen composition here is Cl ⁻ so that the formed tabular grains can easily grow by aging without being dissolved.
The addition of salt and Ag salt is preferred. The addition of this halogen can also stop the introduction of dislocations that impart anisotropic growth properties to the grains.

(2) It is difficult to make only tabular grain nuclei separately during the formation of ripening nuclei. Therefore, grains other than tabular grains are eliminated by Ostwald ripening in the next ripening process. The temperature is preferably 10 ° C. or more higher than the nucleation temperature, usually 65 to 9
0 ° C is used. Non-tabular nuclei disappear by aging and deposit on tabular grains. It is preferable that fine particles having a composition and a size that are more soluble than the flat plate are present in the early stage of the ripening so that the flat plate does not easily disappear in the early stage of the ripening. In addition, it is desirable that new dislocations are not introduced during aging. For that purpose, it is necessary to allow sufficient time after addition of different kinds of halogens or impurities to reach an equilibrium state, or Ag
Addition of a halogen of the same composition as X ₁ results in a different halogen,
Also, it is preferable to limit the influence of impurities to zero.

The physical ripening which is usually carried out before the growth is preferably not carried out until all the fine particles have disappeared. This is because if all the fine particles are eliminated, the corners of the tabular grains will be dissolved, and there will be grains in which the anisotropic growth property of the grains is deteriorated. Therefore, it is preferable to start the growth while the fine particles are present.

The conditions for chemical sensitization in the present invention are as follows:
Although not particularly limited, pAg is 6 to 11, preferably 7 to 10 and temperature is 40 to 95 ° C, preferably 45 to 85 ° C.

In the present invention, it is preferable to use a noble metal sensitizer such as gold, platinum, palladium or iridium together. In particular, it is preferable to use a gold sensitizer in combination, and specific examples thereof include chloroauric acid, potassium chloroaurate, potassium aurithiocyanate, gold sulfide, gold selenide, etc., and 10 -7 to 10 -2 mol / About Ag mol can be used. In the present invention, it is also preferable to use a sulfur sensitizer together. Specifically, thiosulfates (e.g., hypo), thioureas (e.g., diphenyl thiourea, triethyl urea, allyl thiourea), a known unstable sulfur compounds, such as rhodanine and the like, ^{10-7 -2} mol /
About Ag mol can be used. In the present invention, it is also preferable to use a selenium sensitizer together. For example, the unstable selenium sensitizer described in JP-B-44-15748 is preferably used. Specifically, colloidal selenium, selenoureas (eg, N, N-dimethylselenourea, selenourea, tetramethylselenourea), selenamides (eg, selenacetamide, N, N-dimethyl-selenobenzamide), Selenoketones (eg, selenoacetone, selenobenzophenone), selenides (eg, triphenylphosphine selenide, diethyl selenide), selenophosphates (eg, tri-p
-Tolylselenophosphate), selenocarboxylic acid and ester, isoselenocyanate, and the like, and about ^10-8 to ^10-3 mol / Ag mol can be used.

In the present invention, tellurium sensitization is preferably carried out in the presence of a silver halide solvent. Specifically, thiocyanates (for example, potassium thiocyanate) and thioether compounds (for example, US Pat. No. 3,0).
No. 21,215, No. 3,271,157, Japanese Patent Publication 58
-30571, compounds described in JP-A-60-136736, etc., particularly, for example, 3,6-dithia-1,8-octanediol, tetra-substituted thiourea compounds (for example, JP-B-59-11892, U.S.A. Patent No. 4,221,863
Compounds such as tetramethylthiourea), thione compounds described in JP-B-60-11341, mercapto compounds described in JP-B-63-29727, and compounds described in JP-B-60-163042. Examples thereof include mesoionic compounds, selenoether compounds described in U.S. Pat. No. 4,782,013, telluroether compounds described in JP-A-2-118566, and sulfites. Of these, thiocyanates, thioether compounds, tetrasubstituted thiourea compounds and thione compounds can be preferably used. The amount used may be about 10 ⁻⁵ to 10 ⁻² mol / Ag mol. Particularly preferable examples of use and compounds thereof are disclosed in, for example, JP-A-3-11613.
No. 2, No. 5-113635, No. 5-165136,
As described in detail in Nos. 5-165137 and 5-134345. Particularly preferred selenium sensitizers include selenium compounds -I to -X. Tellurium compounds for tellurium sensitizers
I to -X can be mentioned.

[0025]

[Chemical 2]

[0026]

[Chemical 3]

The emulsion of the present invention is preferably subjected to reduction sensitization. As a method of reduction sensitization, Japanese Patent Application Laid-Open No. 2-1
91938, JP-A-2-136852, JP-B-57.
No. 33572, ascorbic acid and its derivatives as a reducing agent, thiourea dioxide, stannous chloride,
Aminoiminomethanesulfinic acid, hydrazine derivative,
Reduction sensitization can be performed using a borane compound, a silane compound, or a polyamine compound. Further, reduction sensitization can be carried out by keeping the pH of the emulsion at 7 or higher and pAg at 8.3 or lower and ripening. Further, reduction sensitization can be carried out by introducing a single addition part of silver ions during grain formation. However, it is preferable to carry out reduction sensitization using ascorbic acid and its derivative or thiourea dioxide in order to reduce the influence of grain formation and crystal growth and to carry out controlled reduction sensitization. The amount of reduction sensitizer used varies depending on the reducing agent species, but an amount of 10 ⁻⁷ to 10 ⁻² mol / Ag mol is preferably used.
The reduction sensitization may be performed anywhere during grain formation and at any time after grain formation and before chemical sensitization.

As a grain analyzing method, a section of the tabular grain is scan-excited with an electron beam to detect emission of halogen atoms (for example, characteristic X-ray) in each section of the section (scanning electron microscope method), Secondary ion mass spectroscopy
The law can be mentioned, Journal of the Photographic Society of Japan, vol. 53, 1
25-131 (1990) can be referred to.

In addition, there may be mentioned a mode in which the whole of the AgX particles is doped with these impurity ions, a mode in which they are doped in a specific place in the AgX particles, and a mode in which they are localized and doped within 0.1 μm from the particle surface. . In this case, the dope concentration is preferably 10 ^-8 to 10 ^-1 mol / mol AgX, more preferably 10 ^-7 to 10 ^-2 mol / mol AgX.
For specific examples of these impurity ions and details of the method of doping the AgX phase, see Research Disclosure, 3
Volume 07, Item 307105, November, 1989,
US Pat. Nos. 5,166,045, 4,933,272 and 5,
No. 164292, No. 5132203, No. 426992
No. 7, No. 4847191, No. 4933272, No. 4
No. 981781, No. 5024931, Japanese Patent Laid-Open No. 4-30
No. 5644, No. 4-321024, No. 1-18364
The descriptions of No. 7, No. 2-20853, No. 1-285941, and No. 3-118536 can be referred to.

At the time of grain growth, the {100} plane formation promoter can be made to coexist according to the above rules. The crystal habit controlling agent causes the equilibrium habit potential of AgX particles produced by the coexistence to be 10 mV or more, preferably 30 to 200 mV.
Refers to compounds that are only raised. Specific examples of the compounds are described in U.S. Pat. Nos. 4,399,215, 4,414,306 and 4;
400463, 4713323, 480462
No. 1, No. 4783398, No. 4952491, No. 4
983508, Journal of Imaging Science, 33
Volume, 13 (1989), Volume 34, 44 (1990)
,), Journal of Photographic Science, 36, 18
2 (1988) can be referred to.

Since most of the grains are {100} planes,
The adsorption group of gelatin (eg, methionine group) is strongly adsorbed to Ag ⁺ on the surface of the grain. Therefore, the adsorption of the spectral sensitizing dye, the antifoggant and other photographic additives may be excluded. In this case, the dispersion medium gelatin having the optimum methionine content can be selected. Specifically, the photosensitive material AgX
The average methionine content of gelatin in the emulsion layer is preferably 0 to 50 μmol / g, and more preferably 3 to 30 μmol / g. The chemical sensitizer can be added to the AgX emulsion at 10 ^-2 to 10 ^-8 mol / mol AgX, and the sensitizing dye can be added at a saturated adsorption amount of preferably 5 to 100% for sensitization.

The obtained particles may be used as host particles, and epitaxial particles may be formed at the edges and / or corners of the particles before use. Further, particles having dislocation lines inside may be formed using the particles as a core. In addition, by using the particles as a substrate and stacking an AgX layer having a halogen composition different from that of the substrate, particles having various known particle structures can be prepared. Regarding these, it is possible to refer to the description of the literature described later. Also,
Chemical sensitization nuclei are usually imparted to the obtained emulsion grains. In this case, it is preferable that the location of the chemically sensitized nuclei and the number / cm ² are controlled. Regarding this, JP-A-2
-838, 2-146033, 1-20165
No. 1, 3-121445, JP-A-64-74540.
No. 3, Japanese Patent Application No. 3-73266, No. 3-140712,
Reference can be made to the description in JP-A-3-115872.

The AgX emulsion grains produced by the method of the present invention can also be used as a blend with one or more other AgX emulsions. The blending ratio can be appropriately selected and used in the range of 1.0 to 0.01.

In the photographic light-sensitive material of the present invention, the following phosphors are used as a fluorescent intensifying screen, and X-ray photography can be preferably carried out. Blue emitting phosphor Y ₂ O ₂ S: Tb, LaOBr: Tb, BaFCl: E
u Green light emitting phosphor Gd ₂ O ₂ : Tb, LaO ₂ S: Tb UV light emitting phosphor Titanium-free hafnium zirconium germanate phosphor described in JP-A-6-11804, YTaO ₄ , YTaO ₄ : Nb Photograph of the present invention There are no particular restrictions on various additives and the like used in the light-sensitive material, and for example, those described in the following relevant parts can be used. Item 1) Silver halide emulsion and JP-A-2-68539, page 8, lower right column, bottom, manufacturing method, line 6 to page 10, upper right column, line 12, 3-2 4537 The second page, right lower column, line 10 to the sixth page, upper right column, first line, the same page 10, upper left column, 16th line, and page 11, lower left column, 19th line, JP-A-4-10742. 2) Chemical sensitization method JP-A-2-68539, page 10, upper right column, line 13 to upper left column, line 16; Japanese Patent Application No. 3-105035. 3) Antifoggant, JP-A-2-68539, page 10, lower left column 17, stabilizer Stabilizer line to page 11, upper left column, line 7 and page 3 left lower column, line 2 to page 4, lower left Column. 4) Color tone improving agent JP-A-62-276539, page 2, lower left column, line 7 to page 10, left lower column, line 20; JP-A-3-94249, page 6, lower left column, line 15 to 1 Page 1, upper right column, line 19 5) Spectral sensitizing dye JP-A-2-68539, page 4, lower right column, line 4 to page 8, lower right column. 6) Surfactant, JP-A-2-68539, page 11, upper left column 14, antistatic agent line to page 12, upper left column, line 9 7) Matting agent, slipping agent, JP-A-2-68539, page 12, upper left column 10, plasticizer line to same upper right column, line 10; page 14 lower left column 10, line 10 to lower right column 1 line . 8) Hydrophilic colloid JP-A-2-68539, page 12, upper right column, line 11 to left lower column, line 16 9) Hardener JP-A-2-68539, page 12, lower left column, line 17 to page 13, upper right column, line 6 10) Support, JP-A-2-68539, page 13, upper right column, lines 7 to 20. 11) Crossover JP-A-2-264944, page 4, upper right column, 20th cutting method, line 14 to upper right column. 12) Dyes and mordants JP-A-2-68539, page 13, lower left column, line 1 to page 14, lower left column, line 9 JP-A-3-24537, page 14, lower left column to page 16, lower right column. 13) Polyhydroxy JP-A-3-39948, page 11, upper left column, benzenes, page 12, lower left column, EP Patent No. 452772A. 14) Layer structure JP-A-3-198041. 15) Development processing method JP-A-2-103037, page 16, upper right column, line 7 to page 19, left lower column, line 15, and JP-A-2-115837, page 3, lower right column, line 5 Page 6, upper right column, line 10

[0035]

EXAMPLES The present invention will now be described in more detail by way of examples, but the embodiments of the present invention are not limited thereto. Example 1 Preparation of Emulsion A of the Invention In a reaction vessel, 1582 ml of an aqueous gelatin solution (gelatin-1) was used.
(Deionized alkali-treated bone gelatin having a methionine content of about 40 μmol / g) 19.5 g, HNO ₃ IN solution 7.
Containing 8 ml, pH 4.3, NaCl-1 solution (100 ml)
13 ml of NaCl (containing 10 g) was added and the temperature was adjusted to 4
While keeping the temperature at 0 ° C, Ag-1 solution (100 mL of AgNO
₃ including 20 g) and X-1 solution (NaCl in 100ml
(Including 7.05 g) was simultaneously mixed and added at 62.4 ml / min in 15.6 ml portions. After stirring for 3 minutes, Ag-2 solution (1
2g AgNO3 in 00ml) and X-2 solution (100g)
1.4g of KBr in ml) 80.6ml / min 2
Simultaneous mixing of 8.2 ml each. After stirring for 3 minutes, Ag-
Solution 1 and solution X-1 were simultaneously mixed and added at a rate of 62.4 ml / minute and 46.8 ml each. After stirring for 2 minutes, gelatin aqueous solution 20
3 ml (gelatin-113 g, NaCl 1.3 g, pH
(Including NaOH 1N solution to make 6.5), and p
After adjusting Cl to 1.75, the temperature was raised to 75 ° C.
11.65 and aged for 3 minutes. Then AgC
The fine particle emulsion (E-1) was added for 20 minutes at an addition rate of 2.68 × 10 ⁻² mol / min AgCl. 40 after addition is complete
After aging for a minute, a precipitating agent was added and the temperature was lowered to 35 ° C.
The precipitate was washed with water. Add gelatin aqueous solution, pH at 60 ℃
Adjusted to 6.0. A TEM image of a replica of the particles was observed. The obtained emulsion had AgBr of 0.
It was a silver chloride {100} tabular grain containing 44 mol%. The shape characteristic value of the grains is (total projected area of {100} tabular grains having an aspect ratio of 2 or more / total projected area of all AgX grains) × 100 = a ₁ = 9
1 (average aspect ratio (average diameter / average thickness) of {100} tabular grains having an aspect ratio of 2 or more) = a ₂ = 12.1 (average diameter of {100} tabular grains having an aspect ratio of 2 or more) = a ₃ = 1.33 μm (ratio of major surface edge lengths of {100} tabular grains having an aspect ratio of 2 or more) = a ₄ = 1.45 (average thickness) = a ₅ = 0.11 μm (corresponding to a circle of the grains) The coefficient of variation of the size distribution of the diameter (standard deviation of size / average thickness) = a ₆ = 0.13 Under the conditions of Example 1, the critical particle size at the start of addition of E-1 was 0.0034 μm ^3. , E-1 addition, the critical particle size was 0.0058 μm ³ .
Therefore, gradually increase the particle size of E-1,
Particles that can be eliminated by the end of nucleation and that are 70% to 100% of the critical particle size are always 50% in number of particles.
A fine grain emulsion containing the above proportions was added.

Preparation of Emulsion B of the Present Invention As the added fine particles E-1, a critical fine particle size of 70 was always used.
The procedure of Emulsion A of the present invention was repeated, except that a fine grain emulsion containing up to 100% of the grains in a proportion of 70% or more was always used. However, Emulsion B of the present invention is superior to Emulsion A of the present invention in anisotropic growth during growth.
-1 The critical particle size at the end of addition is 0.0063 μm
^{Was 3} . The shape characteristic values of the particles are a ₁ = 91, a ₂
= 13.9, a ₃ = 1.39 μm, a ₄ = 1.35, a
₅ = 0.10 .mu.m, was a ₆ = 0.13.

Preparation of Comparative Emulsion C As the added fine particles E-1, 70 having a critical fine particle size was always used.
The same procedure as in the emulsion A of the present invention was carried out except that a fine grain emulsion containing less than 50% of grains in a proportion of 50% or more was always used. However, since Comparative Emulsion C was inferior to Emulsion A of the present invention in anisotropic growth during growth, the critical fine particle size at the end of addition of E-1 was 0.0054 μm ³ . The shape characteristic values of the particles are a ₁ = 91, a ₂ = 9.
_{4, a 3 = 1.22μm, a} 4 = 1.43, a 5 = 0.
It was 13 μm and a ₆ = 0.13.

Preparation of Inventive Emulsion D AgCl fine grain emulsion (E-1) was added to the emulsion of the present invention.
Instead of Ag-3 solution (AgNO in 100 ml)₃50 g
And X-3 solution (17.6 g of NaCl in 100 ml).
Including C.D.J. (controlled double jet), Ag−
Constant flow rate for 10 minutes until the addition amount of 3 liquids reaches 182 ml
Added in. A TEM image of a replica of the particles was observed.
The obtained emulsion had AgBr of 0.44 mol based on silver.
It was a silver chloride {100} tabular grain containing 1% by weight. Of the particles
The shape characteristic value is a₁= 91, a ₂= 9.1, a₃= 1.
36 μm, a_Four= 1.64, a_Five= 0.15 μm, a₆
Was 0.15. Also observe the growing grains of this emulsion
When I did, I was always able to observe the existence of new nuclei.

Preparation of Comparative Emulsion E Except that Ag-3 solution and X-3 solution were added with CDJ and the addition amount of Ag-3 solution reached 182 ml at a constant flow rate over 60 minutes. Inventive Emulsion D was used. The shape characteristic values of the particles are a ₁ = 89, a ₂ = 5.
9, a ₃ = 1.18 μm, a ₄ = 1.64, a ₅ = 0.
It was 20 μm and a ₆ = 0.16. Observation of grains during the growth of this emulsion revealed that the presence of new nuclei could not be observed at any timing of the growth.

Preparation of Emulsion F of the Invention In a reaction vessel, 42.7 liters of an aqueous gelatin solution (gelatin-1 (deionized alkali-treated bone gelatin having a methionine content of about 40 μmol / g) 526.5 g, HNO ₃ 1N) were used.
Solution (210.6 ml, pH 4.3), NaCl-1 solution (100 ml, containing 10 g of NaCl) (351 ml) was added, and the temperature was kept at 40 ° C. while the AgCl seed crystal emulsion (average volume of particles 0.0003 μm ³ , Coefficient of variation 0.10)
Was added in an amount of 0.5 Ag and stirred for 3 minutes, and then Ag-2
The liquid (containing 2 g of AgNO _{3 in} 100 ml) and the liquid X-2 (containing 1.4 g of KBr in 100 ml) were simultaneously mixed in 761 ml at 2.18 l / min. After stirring for 3 minutes, Ag-1 solution (containing 20 g of AgNO3 in 100 ml) and X-1 solution (containing 7.05 g of NaCl in 100 ml) were mixed simultaneously at 1.68 l / min at 1.26 l. Was added. After stirring for 2 minutes, 5.48 liters of aqueous gelatin solution (gelatin-1 351 g, NaCl
(35.1 g, containing NaOH 1N solution for adjusting the pH to 6.5) was added to adjust the pCl to 1.75, and then the temperature was adjusted to 7
The temperature was raised to 5 ° C., the mixture was adjusted to pCl1.65 and aged for 3 minutes. Then, AgCl fine grain emulsion (E-1) was added to 7.24.
It was added for 20 minutes at an addition rate of AgCl of × 10 ^-1 mol / min. After aging for 40 minutes after the addition was completed, a precipitating agent was added, the temperature was lowered to 35 ° C., and the precipitate was washed with water. An aqueous gelatin solution was added, and the pH was adjusted to 6.0 at 60 ° C. A TEM image of a replica of the particles was observed. The resulting emulsion was silver chloride {100} tabular grains containing 0.44 mol% of AgBr based on silver. The shape characteristic value of the particles is a ₁ = 91, a
_{2 = 8.4, a 3 = 1.17μm} , a 4 = 1.15, a
₅ = _0.14μm, was a ₆ = 0.12. As added fine particles E-1, it can disappear by the end of nucleation, and
A fine grain emulsion containing always less than 70% of the critical fine grain size and always 50% or more of the number of grains was used. The critical fine particle size of the emulsion F of the present invention at the start of addition of E-1 was 0.
0071 μm ³ , and the critical particle size at the end of addition of E-1 was 0.008 μm ³ .

Comparative Emulsion G was prepared in the same manner as Emulsion F of the present invention except that Ag-1 solution and X-1 solution were mixed simultaneously at 421 ml each at 1.68 l / min instead of the prepared seed crystal emulsion. The shape characteristic value of the particles is a
₁ = 91, a ₂ = 8.3, a ₃ = 1.13 μm, a ₄ =
1.15, a ₅ = 0.15 μm, a ₆ = 0.38

Chemical sensitization Each emulsion prepared as described above was stirred at 60
Chemical sensitization was performed while the temperature was kept at ℃. First, thiosulfonic acid compound-I was added in an amount of 10 ^-4 mol per mol of silver halide, and then thiourea dioxide was added in an amount of 1 × 10 ^-6 mol / mol Ag, and the mixture was kept for 22 minutes to carry out reduction sensitization. did. Next, 4-hydroxy-6-methyl-1,3,3
a, 7-tetraazaindene at 3 × 10 ⁻⁴ mol / mol A
g and sensitizing dyes-1 and 2 were added respectively. Further calcium chloride was added. Then sodium thiosulfate (6 × 10 ⁻⁶ mol / mol Ag) and selenium compound-I
(4 × 10 ⁻⁶ mol / mol Ag) was added. Chloroauric acid 1 × 10 ⁻⁵ mol / mol Ag and potassium thiocyanate × 10 ⁻³ mol / mol Ag were further added, and 40 minutes later, 35
Cooled to ° C. Thus, the preparation (chemical ripening) of the emulsion was completed.

[0043]

[Chemical 4]

(Preparation of emulsion coating layer) An emulsion coating solution was prepared by adding the following chemicals to 1 mole of silver halide to the chemically sensitized emulsion.・ Gelatin (including gelatin in emulsion) 111 g ・ Dextran (average molecular weight 39,000) 21.5 g ・ Sodium polyacrylate (average molecular weight 400,000) 5.1 g ・ Sodium polystyrene sulfonate (average molecular weight 600,000) 1.2 g-Hardener 1,2-bis (vinylsulfonylacetamide) ethane Addition amount was adjusted so that the swelling ratio would be 230% -Compound-I 42.1 mg-Compound-II 10.3 g-Compound- III 0.11 g-Compound-IV 8.5 mg-Compound-V 0.43 g-Compound-VI 0.004 g-Compound-VII 0.1 g-Compound-VIII 0.1 g NaOH adjusted to pH 6.1.

[0045]

[Chemical 5]

[0046]

[Chemical 6]

Dye Emulsion A was added to the above coating solution so that the amount of Dye-I was 10 mg / m ² per side.

[0048]

[Chemical 7]

(Preparation of Dye Emulsion A)
0g and 62.8 g of the following high boiling point organic solvent-I, -II
Of 62.8 g and 333 g of ethyl acetate were dissolved at 60 ° C. Next, 65 cc of a 5% aqueous solution of sodium dodecyl sulfonate, 94 g of gelatin and 581 cc of water were added, and the mixture was emulsified and dispersed by a dissolver at 60 ° C. for 30 minutes. Next, 2 g of the following compound-VI and 6 liters of water were added, and the temperature was lowered to 40 ° C. Next, Asahi Kasei Ultrafiltration Laboratory Module AC
Using P1050, the mixture was concentrated to a total amount of 2 kg, and 1 g of the compound VI was added to obtain a dye emulsion A.

[0050]

[Chemical 8]

(Preparation of Coating Solution for Surface Protective Layer) A coating solution for surface protective layer was prepared so that each component had the following coating amount.・ Gelatin 0.780 g / m ²・ Sodium polyacrylate (average molecular weight 400,000) 0.035 ・ Sodium polystyrene sulfonate (average molecular weight 600,000) 0.0012 ・ Polymethyl methacrylate (average particle size 3.7 μm) 072-Coating aid-I 0.020-Coating aid-II 0.037-Coating aid-III 0.0080-Coating aid-IV 0.0032-Coating aid-V 0.0025-Compound-VI 0.0022 ・ Proxel 0.0010 (pH adjusted to 6.8 with NaOH)

[0052]

[Chemical 9]

(Preparation of Support) (1) Preparation of Dye Dispersion B for Undercoat Layer Dye-II below was ball milled by the method described in JP-A-63-197943.

[0054]

[Chemical 10]

Water 434 cc and Triton X200
(Registered trademark) surfactant (TX-200 (registered trademark))
And 791 cc of a 6.7% aqueous solution of the above were placed in a 2 liter ball mill. 20 g of dye were added to this solution. 400 ml of zirconium oxide (ZrO ₂ ) beads (2 mm diameter) were added and the contents were milled for 4 days. After this, 160 g of 12.5% gelatin was added. After defoaming, Zr by filtration
The O ₂ beads were removed. Observing the obtained dye dispersion, the particle size of the crushed dye was 0.05 to 1.15μ.
It has a wide field up to m and the average particle size is 0.3.
It was 7 μm. Further, a centrifugation operation was performed to remove dye particles having a size of 0.9 μm or more. Thus, Dye Dispersion B was obtained.

(2) Preparation of Support Corona discharge was performed on a biaxially stretched polyethylene terephthalate film having a thickness of 175 μm, and the first undercoating liquid having the following composition was applied at an amount of 4.9 cc / m ^2. Thus, it was applied by a wire converter and dried at 185 ° C. for 1 minute. Next, a first undercoat layer was similarly provided on the opposite surface. The polyethylene terephthalate used is a dye-
I containing 0.04 wt% was used.・ Butadiene-styrene copolymer latex solution (solid content 40% butadiene / styrene weight ratio = 31/69) 158cc ・ 2,4-dichloro-6-hydroxy-s-triazine sodium salt 4% solution 41cc ・ Distilled water 801cc * The latex solution contains the following compounds as emulsifying dispersants in an amount of 0.4 wt% based on the latex solids.

[0057]

[Chemical 11]

(3) Coating of undercoat layer On each of the above-mentioned first undercoat layers, a second undercoat layer having the following composition is applied on each side so that the coating amount is as described below. To the wire bar coder method,
It was dried at 155 ° C.・ Gelatin 80 mg / m ²・ Dye Dispersion B (as dye solid content) 8 ・ Coating aid-VI 1.8 ・ Compound-VIII 0.27 ・ Mat agent Polymethylmethacrylate 2.5 with an average particle size of 2.5 μm

[0059]

[Chemical 12]

(Preparation of Photographic Material) The support prepared as described above was combined with the above emulsion layer and surface protective layer and coated on both sides by the simultaneous extrusion method. The coated silver amount per one side was 1.75 g / m ² .

(Evaluation of Photographic Performance) A photographic material was changed to Du Po.
Ultravision first detail manufactured by nt was used to bring them into close contact with both sides, and an exposure of 0.05 seconds was applied from both sides, and X-ray sensitometry was performed. To adjust the exposure amount,
It was performed by changing the distance between the X-ray tube and the cassette. After the exposure, the sensitivity was evaluated using the following automatic developing machine and processing solution. The sensitivity was expressed as the logarithm of the reciprocal of the exposure required to give a density of fog + 0.1, and the other was expressed as a relative value with the sensitivity of the comparative emulsion being 100.

(Processing) Automatic processor ---- CEPROS- manufactured by FUJIFILM Corporation
30 was used and it was set to Dry to Dry 30 seconds. Preparation of Concentrated Liquid <Developer> Part Agent A Potassium hydroxide 330 g Potassium sulfite 630 g Sodium sulfite 255 g Potassium carbonate 90 g Boric acid 45 g Diethylene glycol 180 g Diethylenetriaminepentaacetic acid 30 g 1- (N, N-diethylamine) ethyl-5-mercaptotetrazole 0. 75 g Hydroquinone 450 g 4-Hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone 60 g Water was added to 4125 ml.

[0063] Parts agent B   Diethylene glycol 525g   3,3 'dithiobishydrocinnamic acid 3g   Glacial acetic acid 102.6g   2-nitroindazole 3.75 g   1-phenyl-3-pyrazolidone 34.5 g   750ml with water

[0064] Parts agent C   Glutaraldehyde (50wt / wt%) 150g   Potassium bromide 15g   Potassium metabisulfite 105g   750ml with water

[0065] <Fixer>   Ammonium thiosulfate (70wt / vol%) 3000ml   Ethylenediaminetetraacetic acid / disodium / dihydrate 0.45 g   225g of sodium sulfite   Boric acid 60g   1- (N, N-diethylamine) -ethyl-5-mercapto     Tetrazole 15g   Tartaric acid 48g   Glacial acetic acid 675g   225g of sodium hydroxide   Sulfuric acid (36N) 58.5g   Aluminum sulfate 150g   6000 ml with water added     pH 4.68

(Preparation of Processing Solution) The developer solution was filled in the following containers for each parts agent. In this container, the partial containers of the parts agents A, B and C are connected together by the container itself. Further, the above fixing solution concentration was filled in the same kind of container. First, as a starter in the developing tank,
Aqueous solution 30 containing 54 g of acetic acid and 55.5 g of potassium bromide
0 ml was added. Insert the above treatment agent container upside down and insert it into the perforation blade of the treatment solution stock tank mounted on the side of the automatic processing machine to break the sealing film of the cap and transfer each treatment agent in the container to the stock tank. Filled. These processing agents were filled in the developing tank and fixing tank of the developing machine at the following ratios by operating the pumps installed in the developing machine. Also,
Every time 8 sheets of photosensitive material were processed in terms of four-cut size, the processing agent stock solution and water were mixed at this ratio and replenished in the processing tank of the developing machine.

Developer Parts liquid A 51 ml Parts liquid B 10 ml Parts liquid C 10ml 125 ml of water pH 10.50 Fixer Concentrated liquid 80ml 120 ml of water pH 4.62 The wash tank was filled with tap water.

As a water stain preventive agent, 0.4 g of actinomycetes supported on perlite having an average particle size of 100 μm and an average pore size of 3 μm was covered with a polyethylene bottle (the bottle opening was covered with a 300-mesh nylon cloth. Prepare three pieces filled with water and fungi from the cloth), two of them at the bottom of the washing tank, and one at the bottom of the stock tank for washing water (liquid volume 0.2 liters). I sunk each. Image of processing speed and processing temperature 35 ° C 8.8 seconds Fixed 32 ° C 7.7 Washed with water 17 ° C 3.8 Squeeze 4.4 Dry 58 ° C 5.3 Total 30 Replenishment amount Developer 25 ml / 10 × 12 inches Fixer 25ml / 10 x 12 inches

The obtained light-sensitive material of the present invention was used in Japanese Patent Laid-Open No. 6-118.
When an image was formed by X-ray exposure using the phosphor screen described in No. 04, it was confirmed that a good X-ray image was formed.

[0070]

Surprisingly, when the shape characteristic values of the grains of the emulsions A and B of the present invention and the comparative emulsion C are compared, the emulsions A and B of the present invention are compared.
It is understood that the emulsion is thin, and is superior to the comparative emulsion C in the anisotropic growth property. Further, it can be seen that the emulsion B of the present invention is more excellent in anisotropic growth than the emulsion A of the present invention. From this, it can be seen that control of the size of fine particles used for grain growth is very important.

Surprisingly, when the shape characteristic values of the grains of the emulsion D of the present invention and the comparative emulsion E were compared, it was found that the anisotropic growth of the emulsion D of the present invention was still thin, and the comparative emulsion E in the anisotropic growth was superior. You can see that it is superior to. From this, it can be seen that it is important to grow the particles at an addition flow rate at which new nuclei are generated and to keep the state in which the new nuclei do not disappear.

Surprisingly, when the shape characteristic values of the grains of Inventive Emulsion F and Comparative Emulsion G were compared, the monodispersity of the projected area of the grains of Inventive Emulsion F was extremely superior to that of Comparative Emulsion G. I understand that This shows that it is important to use monodisperse seed crystals in order to produce the tabular grains with good reproducibility and monodispersity.

Table 1 shows the results of the sensitivity of the photographic light-sensitive materials of Emulsions A and B of the present invention and Comparative Emulsion C. (The sensitivity of emulsion C is 100
And)

[0074]

[Table 1]

As is clear from Table 1, from the viewpoint of fogging, it was not possible to find any significance between the light-sensitive material of the present invention and the comparative light-sensitive material. It can be seen that the material is highly sensitive for rapid processing. In addition, 70% or more of the volume of the critical particles is 70% of this effect.
Particle growth was performed by adding ~ 100% of fine particles,
It was remarkable in the light-sensitive material using the emulsion B of the present invention.

The results of the sensitivity of the photographic light-sensitive materials of the emulsion D of the present invention and the comparative emulsion E are shown in Table 2. (The sensitivity of emulsion E is 100)

[0077]

[Table 2]

As is clear from Table 2, from the viewpoint of fogging, it was not possible to find any significance between the light-sensitive material of the present invention and the comparative light-sensitive material, but from the viewpoint of photographic sensitivity, the light-sensitive material of the present invention was found. It can be seen that the material is highly sensitive for rapid processing.

Table 3 shows the results of the sensitivity of the photographic light-sensitive materials of Emulsion F of the present invention and Comparative Emulsion G. (The sensitivity of emulsion G is 100)

[0080]

[Table 3]

As is clear from Table 3, from the viewpoint of fogging, it was not possible to find any significance between the light-sensitive material of the present invention and the comparative light-sensitive material, but from the viewpoint of photographic sensitivity, the light-sensitive material of the present invention was found. It can be seen that the material is highly sensitive for rapid processing.

Example 2 Emulsions A to G were chemically sensitized by using tellurium compound-I instead of selenium compound-I. Others were the same as in Example 1.

Similar to the selenium compound, the photosensitive material using the emulsion of the present invention with the tellurium compound had high sensitivity in rapid processing.

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI G03C 5/17 G03C 5/17 (58) Fields investigated (Int.Cl. ⁷ , DB name) G03C 1/015 G03C 1/035 G03C 1/06 502 G03C 1/00 G03C 5/17

Claims (5)

(57) [Claims] 1. In a silver halide emulsion having at least a dispersion medium and silver halide grains, 30% or more of the total projected area of the silver halide grains has a {100} plane as a main plane and an aspect ratio (diameter / diameter). Tabular grains having a thickness of 1.5 or more and a Cl content of 20% or more, and the addition of fine grains containing 90% or more of silver halide fine grains capable of eliminating the growth of the silver halide grains, and the added fine grains. When counted in descending order of volume, 50% or more of the total number of added fine particles is 70% to 100% of the maximum fine particle volume that can be lost by growth.
A silver halide emulsion characterized by being fine particles having a volume of. 2. When the added fine particles are counted in descending order of volume, 70% or more of the total number of added fine particles are fine particles having a volume of 70% to 100% of the maximum fine particle volume that can be eliminated by growth. The silver halide emulsion according to claim 1, which is characterized in that 3. A according to claim 1 or 2 Cl content of the tabular grains after particle formation, characterized in that not less than 40%
Of the silver halide emulsion. 4. A silver halide photographic light-sensitive material comprising at least one of the emulsions according to any one of claims 1 to 3 on both sides of a support. 5. The silver halide radiation according to claim 4.
An image forming method characterized in that a light- sensitive material is used in combination with a fluorescent intensifying screen which emits light by X-ray exposure having a peak at 400 nm or less.