JPH0497343A - Development processing method for silver halide photographic sensitive materila - Google Patents

Abstract

PURPOSE:To prevent the degradation in image quality and to widen the latitude of the photosensitive material as well as to improve a diagnosing ability by specifying the silver halide particles in silver halide emulsion layers, the total processing time the optical density of the resulted images and exposure. CONSTITUTION:The flat plate silver halide particles having >=3 aspect ratio are used for >=50% of the total projection area of the silver halide particles in the silver halide emulsion layers. The total processing time (Dry to Dry) is specified to 10 to 60 seconds. In addition, the inclination (gamma1) of the straight line connecting the point of 0.5 optical density and 1.5 in the characteristic curve on the rectilinear coordinate system in which the coordinate unit lengths of the optical density (D) of the resulted images and the exposure (logE) are equal is 2.0 to 2.7. The inclination (gamma2) between the optical density 2.0 and 2.5 is specified to 0.7 to 1.5. The degradation in the image quality is prevented in this way and the magnitude of the photosensitive material is widened. The diagnosing ability is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for developing a silver halide photographic material for X-rays, which widens the latitude of a sensitive material without deteriorating image quality and improves diagnostic ability. It is something.

(Prior Art) Silver halide photographic materials for X-rays have been widely used and have been used successfully for early detection of diseased areas. but,
The absorption rate of X-rays differs depending on the body shape of the health examiner, and it is extremely difficult to determine the optimal exposure dose for each individual, especially when conducting a group health check with a large number of people. The resulting images may be overexposed or underexposed, and with conventional high gamma sensitive materials, the latitude is too narrow and it is difficult to obtain sufficient diagnostic ability.

To improve this, Japanese Patent Laid-Open No. 61-116346 describes a method of increasing the diagnostic ability by lowering the gamma in the high-density portion of the gradation of the characteristic curve to widen the latitude. However, the gradations described here cannot be said to be sufficient for improving latitude. Furthermore, in the method described in JP-A No. 59-214027, in which a development inhibitor is added to the developer to suppress development and soften high-density areas, the concentration of the development inhibitor decreases during large-scale running. It is difficult to obtain a stable characteristic curve.

Furthermore, in large hospitals, etc., there are cases where the number of sheets processed per day is extremely large, and in such situations, it is necessary to speed up the processing even more. Regarding that, JP-A-60-41035
The method described in
ry (60 seconds), the remaining color due to dye staining is extremely impractical.

In addition, the definition of γ is that when the transmission density difference △D between two points on the coordinate axis and the fogE difference △fogE of the exposure amount E are taken as units, γ is drawn on rectangular coordinates where △D/△1ogE=1. At that point (D, fogE
) to another point (D', fogE') can be expressed as the tangent (tanθ) of the angle θ formed with the AogE axis.

(Problems to be Solved by the Invention) An object of the present invention is to provide a silver halide photographic material for X-rays, which widens the latitude of the sensitive material and improves diagnostic ability without deteriorating image quality.

(Means for Solving the Problems) The above-mentioned object of the present invention is to provide a method for developing a photographic light-sensitive material having at least one silver halide emulsion layer on a support after exposing the silver halide emulsion layer. 50% or more of the total projected area of silver halide grains in the emulsion layer is tabular silver halide grains with an aspect ratio of 3 or more, the total processing time (Dry to Dry) is 10 to 60 seconds, and The point of optical density 0.5 on the characteristic curve on the rectangular coordinate system with the same coordinate unit length of the optical density (D) and the exposure amount (fogE) of the image obtained by 1. The slope of the straight line connecting the points 5 (γ
1) is 2°0 to 2.7, and the optical density is 2.0 and 2.5.
This was achieved by a method for developing a silver halide photographic light-sensitive material, which is characterized in that the slope (γ,) between .

γ2 is more preferably 0.8 to 1. It is 2.

In addition, the definition of γ (gamma) in the present invention is △D/△ when the difference in transmission density (△D) and the difference in exposure (E) (△fogE) between two points on the coordinate axes are taken as units, respectively.
In the characteristic curve drawn on rectangular coordinates where 1+ogE=l, one point (D.

fogE) to one other point (D', ffogE'
) is expressed as the tangent (tanθ) of the angle (θ) formed by the vector toward the fogE axis.

Next, the silver halide grains used in the present invention will be explained.

The tabular silver halide grains of the present invention have a diameter/thickness ratio (aspect ratio) of 3 or more, more preferably 5 or more and 50 or less, particularly preferably 5 or more and 20 or less.

The diameter of a silver halide grain herein refers to the diameter of a circle having an area equal to the projected area of the grain. In the present invention, the diameter of the tabular silver halide grains is 0.5 to 5°0μ, preferably 0μ.
．． It is 5 to 2.0μ.

Generally, tabular silver halide grains are tabular with two parallel surfaces, and therefore, in the present invention, "thickness" refers to the distance between the two parallel surfaces constituting the tabular silver halide grains. expressed.

In the emulsion layer containing tabular silver halide grains of the present invention, 50% or more (in terms of projected area) of all silver halide grains are tabular grains with an aspect ratio of 3 or more, preferably 7.
0% or more, particularly preferably 90% or more, has an aspect ratio of 3
These are the tabular grains described above.

The halogen composition of the tabular silver halide grains of the present invention has a silver iodide content of 0 to 2.0 mol%, preferably silver iodobromide, and a silver iodide content of 0 to 1.0 mol%. % of silver iodobromide is particularly preferred.

The tabular silver halide grains can be produced by appropriately combining methods known in the art.

The tabular silver halide emulsion is disclosed in JP-A-58-127.92.
1, JP-A-58-113,927, JP-A-58-113
It can be easily prepared by referring to the method described in , 928.

In addition, a seed crystal in which tabular grains are present in an amount of 40% or more by weight is formed in an atmosphere with a relatively low pBr value of pBrl, 3 or less, and silver and halogen solutions are simultaneously added while maintaining the pBr value at the same level. Obtained by growing seed crystals.

During this grain growth process, it is desirable to add a silver and halogen solution to prevent the generation of new crystal nuclei.

The size of the tabular silver halide grains can be adjusted by controlling the temperature, selection of the type and amount of solvent, the silver salt used during grain growth, the addition rate of halide, etc.

When producing the tabular silver halide grains of the present invention, grain size and shape (diameter/thickness ratio, etc.), grain size distribution, and grain growth rate can be controlled by using a silver halide solvent as necessary. .

For example, by increasing the amount of solvent used, the particle size distribution can be made monodisperse and the growth rate can be increased. On the other hand, there is also a tendency for the thickness of the particles to increase with the amount of solvent used.

Silver halide solvents that can be used in the present invention include U.S. Pat. No. 3,271,157, U.S. Pat.
No. 289, same No. 3. 574. No. 628, Japanese Patent Publication No. 1983
(a) Organic onythyl compounds described in JP-A-1019, JP-A No. 54-158917, etc.; Urea derivatives, JP-A-53-14431
(C) A silver halide solvent having a thiocarbonyl group sandwiched between an oxygen or sulfur atom and a nitrogen atom, described in No. 9, and (d) described in JP-A-54-100717.
Examples include imidazoles, (e) sulfites, and (f) thiocyanates.

Particularly preferred solvents include thionanate and tetramethylthiourea. The amount of solvent used also varies depending on the type; for example, in the case of thiocyanate,
The preferred amount is 1X10-' mole or more IX] and 0-2 or less per mole of silver halide.

When producing the tabular silver halide grains of the present invention, a silver salt solution (for example, A g N O
s aqueous solution) and halide solution (e.g. KBr aqueous solution)
A method of increasing the addition rate, amount, and concentration of addition is preferably used.

Even if the crystal structure of silver halide grains is similar to the inside, there are also cases where the inside and outside have a different layered structure.
Preferably, those with external halogen conversion by adding KI, British Patent No. 635,841, US Patent No. 3,622,
It may be of the so-called conversion (halogen conversion) type as described in No. 318. Conversion may be performed not only by the KI solution but also by adding Agr fine particles.

The emulsions of this invention can be selenium sensitized.

Here, selenium sensitization is carried out by a conventionally known method. That is, this is usually carried out by adding an unstable selenium compound and/or a non-unstable selenium compound and stirring the emulsion at a high temperature, preferably 40° C. or higher, for a certain period of time. Preferably, selenium sensitization using an unstable selenium sensitizer described in Japanese Patent Publication No. 15748/1974 is used.

Specific unstable selenium sensitizers include aliphatic isoselenonoanates such as allyl isoselenocyanate, selenoureas, selenoketones, selenoamides, selenocarboxylic acids and esters, and selenophosphates.

Selenium sensitization using non-labile selenium sensitizers described in Japanese Patent Publication No. 46-4553, Japanese Patent Publication No. 51-34492, and Japanese Patent Publication No. 51-34491 is also used. Non-labile selenium compounds include, for example, selenite, potassium selenosoanide, selenazole compounds, quaternary ammonium salts of selenazole compounds, diarylselenide, diaryldiselenide,
-thioselenazolidinedione, 2-selenooxolidinethione, derivatives thereof, and the like.

The non-unstable selenium sensitizer and thioselenazolidinedione compound described in Japanese Patent Publication No. 52-38408 is also effective.

The silver halide photographic emulsion of the present invention can achieve higher sensitivity and lower fog by combining sulfur sensitization and/or gold sensitization in chemical sensitization.

Sulfur sensitization usually involves adding a sulfur sensitizer to
This is preferably carried out by stirring the emulsion at 40° C. or higher for a certain period of time.

Gold sensitization is usually carried out by adding a gold sensitizer and stirring the emulsion at a high temperature, preferably 40° C. or higher, for a certain period of time.

The gold sensitizer for the above-mentioned gold sensitization may have an oxidation number of +1 or +3, and gold compounds commonly used as gold sensitizers may be used. Typical examples include chlorauric acid, potassium chloroaurate, auric trichloride, potassium auric thiocyanate, potassium iodoaurate, tetracyanoauric acid, ammonium aurothiocyanate, and pyridyl trichlorogold.

In the layer containing the tabular silver halide grains of the present invention,
It is preferable that the tabular grains are present in an amount of 40% or more, particularly 60% or more by weight of all the silver halide grains in the core layer.

The thickness of the layer containing tabular silver halide grains is from 0.3 to
It is preferably 5.0μ, particularly 0.5 to 4.0μ.

Also, the coating amount of tabular silver halide grains (for one side)
is preferably 0.5 to 6 g/m, particularly 1 to 4 g/m.

The feature of the present invention is that tabular grains are used, and γ is 2.0 to 2.0.
2.7, γ2 is 0.7 to 1. The purpose is to prepare an emulsion layer so as to have a value of 5. An emulsion having such characteristics can be prepared by appropriately combining the tabular grain preparation methods described above. As a particularly preferable preparation method, for example, it is preferable to use ammonia in the process of grain growth after nucleation. In particular, it is preferable to add ammonia during grain growth.

In particular, γ2 can be changed by changing the amount of KIO in a method in which a KI aqueous solution is added after nucleation, and then ammonia is added during particle growth using the double jet method.

Alternatively, as another preferred method, a desired γ can be obtained by preparing a plurality of monodispersed tabular grain emulsions, changing their grain sizes and average aspect ratios as appropriate, and using them in a mixed manner or by applying multilayer coating. .

In addition to tabular silver halide grains, the emulsion layer of the silver halide photographic light-sensitive material of the present invention contains ordinary silver halide grains (
For example, spherical particles) can be included.

In the process of silver halide grain formation or physical ripening,
A cadmium salt, a zinc salt, a lead salt, a thallium salt, an iridium salt or a complex salt thereof, a rhodium salt or a complex salt thereof, an iron salt or an iron complex salt, etc. may be present. Further, if necessary, chemical sensitization can be carried out in the same manner as tabular silver halide grains.

The photographic emulsion (for example, the emulsion containing tabular grains) used in the present invention contains various compounds for the purpose of preventing fog or stabilizing photographic performance during the manufacturing process, storage, or photographic processing of the light-sensitive material. can be contained. i.e. azoles such as benzothiazolium salts,
Nitroindazoles, Nitrobenzimidazoles,
Chlorobenzimidazoles, bromobenzimidazoles, mercaptothiazoles, mercaptobenzothiazoles, mercaptobenzimidazoles, mercaptothiadiazoles, aminotriazoles, benzotriazoles, nitrobenzotriazoles, mercaptotetrazoles (especially l-phenyl- mercaptopyrimidines; mercaptotriazines; thiosilicate compounds such as oxazolinthione; azaindenes, such as triazaindenes, tetraazaindenes (especially 4-hydroxy substituted (1,3,3a,7 ), pentaazaindenes, etc.; many compounds known as antifoggants or stabilizers can be added, such as benzenethiosulfonic acid, benzenesulfinic acid, benzenesulfonic acid amide, etc. For example, U.S. Patent 3,95
4゜474, 3,982,947, Special Publication No. 522
8.660 can be used.

The tabular silver halide grains used in the present invention are spectrally sensitized with a sensitizing dye.

The dyes used include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holobolane dyes, hemicyanine dyes, styryl dyes, and hemioxonol dyes. Particularly useful dyes are those belonging to the cyanine dyes, merocyanine dyes, and complex merocyanine dyes. Any of the nuclei commonly used for cyanine dyes can be used as the basic heterocyclic nucleus for these dyes. That is, pyrroline nucleus, oxosaline nucleus, thiazoline nucleus, pyrrole nucleus, oxazole nucleus, thiazole nucleus, selenazole nucleus, imidazole nucleus, tetrazole nucleus, pyridine nucleus, etc.; nuclei in which an alicyclic hydrocarbon ring is fused to these nuclei; and these A nucleus in which an aromatic hydrocarbon ring is fused to the nucleus of Imidazole nuclei, quinoline nuclei, etc. can be applied.

These nuclei may be substituted on carbon atoms.

Melonanine dyes or complex merocyanine dyes include a pyrazolin-5-one nucleus, a thiohydantoin nucleus, and a 2-thioxazolidine-2 nucleus having a ketomethylene structure.
, 4-dione nucleus, thiazolidine-2,4-dione nucleus, rhodanine nucleus, thiobarbic acid nucleus, and the like can be applied.

Specifically, Research Disclosure Volume 176R
D-17643 (December 1978 issue), page 23, and those described in U.S. Pat. Nos. 4,425,425 and 4.425.426 can be used.

The amount of sensitizing dye used is tabular silver halide grains 1
Per mole, O, 1 to 10 cm is preferable, and 200 to 60
0■ is particularly preferred.

The timing of adding the sensitizing dye used in the present invention to the emulsion is as follows:
This is generally carried out before the emulsion is coated on a suitable support, but it may also be carried out in a chemical ripening step or in a silver halide grain forming step.

As a hydrophilic binder that can be used in the emulsion layer or intermediate layer of the light-sensitive material of the present invention, it is advantageous to use gelatin, but other hydrophilic colloids can also be used.

A variety of synthetic hydrophilic polymeric materials can be used, such as single or copolymers of dextran, polyvinyl alcohol, polyvinyl alcohol partial acetal, poly-N-vinylpyrrolidone, polyacrylic acid, polyacrylamide, and polyvinylimidazole.

As the gelatin, in addition to lime-treated gelatin, acid-treated gelatin or enzyme-treated gelatin may be used, and hydrolysates of gelatin may also be used.

Among these, it is preferable to use dextran and polyacrylamide together with gelatin. The amount of binder applied is preferably as small as possible, for example 1. 0-5
．． It is preferably 0 g/rn', especially 1.0 to 4 g/d.

In addition, the photographic material of the present invention may optionally include an intermediate layer,
It can have a filter layer, an antihalation layer, etc.

In the photographic light-sensitive material of the present invention, the photographic emulsion layer and other layers are coated on a flexible support such as plastic film, paper, or cloth, which is commonly used for photographic light-sensitive materials.

In the present invention, there are no particular limitations on the method of coating the emulsion layer, surface protective layer, etc. on the support, but for example, U.S. Pat.
The multilayer simultaneous coating method described in JP-A No. 2,761,791 and the like can be preferably used.

Photographic processing of the light-sensitive material of the present invention is carried out by Y to Dryl.
Processed for 0 to 60 seconds, γ, = 2.0 to 2.7.720.
5 to 1.5, for example, Research Disclosure 176
Any of the known methods and known treatment liquids as described in No. 28-3o (RD-1, 7643) can be applied. Processing temperature is usually 18°C to 5
Temperature selected between 0℃ but lower than 18℃ or 50℃
The temperature may exceed .

The developer used in X-ray photographic processing can contain known developing agents. As developing agents, dihydroquinobenzenes (e.g. hydroquinone), 3
-pyrazolidones (e.g. 1-phenyl-3-pyrazolidone), aminophenols (e.g. N-methyl-
p-ruaminophenol and the like can be used alone or in combination. The developer generally contains other known preservatives, alkaline agents, pH buffers, antifoggants, etc.
In addition, as necessary, solubilizing agents, color toning agents, development accelerators (e.g., quaternary salts, hydrazine, benzyl alcohol), surfactants, antifoaming agents, water softeners, hardeners (e.g., glutaraldehyde), viscosity It may also contain an imparting agent and the like.

As a special form of development processing, a developing agent is added to the light-sensitive material.
For example, a method may be used in which the photosensitive material is included in the emulsion layer and the photosensitive material is processed in an alkaline aqueous solution to perform development. Among the developing agents, hydrophobic ones are described in Research Disclosure No. 169 (RD-16928), U.S. Patent No. 2,
They can be incorporated into the emulsion layer by a variety of methods, such as those described in US Pat. Such development treatment may be combined with silver salt stabilization treatment with thioanate.

As the fixer, one having a commonly used composition can be used. As the fixing agent, in addition to thiosulfates and thiocyanates, organic sulfur compounds known to be effective as fixing agents can be used.

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

In addition to the various additives used in the photosensitive material of the present invention, those described in the following relevant sections of JP-A No. 2-68539 can be used.

Spectral sensitizing dye 9, support page 4, lower right column, line 4 to page 8, lower right column, page 13, upper right column, lines 7 to 20.

(Example) Next, the present invention will be illustrated with reference to Examples, but the present invention is not limited thereto.

Example 1 (1) Preparation of photographic material A potassium bromide solution containing 2.0 mol% potassium iodide and an ammoniacal silver nitrate solution were added to an aqueous seratin solution while gradually increasing the flow rate. .1μm
A monodispersed silver iodobromide octahedral emulsion was obtained. Further, ammoniacal silver nitrate and potassium bromide solution were added by a double jet method, and a shell of pure silver bromide was covered. This emulsion is called ■. This emulsion (2) was a regular octahedral monodispersed emulsion with an average grain size of 1.25 μm.

In addition, by the same manufacturing method as the above emulsion, the average grain size was 0°65 μm.
A regular octahedral monodisperse emulsion (2) was prepared.

Further, silver iodobromide emulsions with the same halide composition as emulsions ① and ① were prepared by a forward mixing method to obtain a 1.05 μm twin-type polydisperse emulsion@
I got it. In addition, the average grain size was 0.35μ by the same manufacturing method as Emulsion C.
A twinned polydisperse emulsion 0 of m was obtained. The aspect ratios of ■, ■, @, and 0 were 1.2, 1.3, 2.0, 2, and ■, respectively.

After desalting and total sensitization and sulfur sensitization of these emulsions, 4-hydroxy-6-methyl 1.3,3a,7
- Stabilized by adding citrazaindene, and mixing emulsion ■ and emulsion ■ in the ratio of 65:35, emulsion @ and emulsion ◎ in the ratio of 85 and ■5, and emulsion ■ and emulsion 0 in the ratio of 8515 [F
], [F], @, and the sensitizing dye amphitheater 5,5'-di-chloro-9ethyl-3,3'-di(3-sulfo) was added to the same amount of silver halide in both emulsions. propyl)
The same amount of oxacarbocyanine hydroxide sodium salt was added. A coating solution was prepared by adding a coating aid and a hardening agent to this emulsion.

Comparative photographic materials ① to ① were obtained by coating and drying the above silver halide emulsion on a polyethylene terephthalate support simultaneously with a surface protective layer.

Coated silver amount is 2g/m (one side), coated gelatin amount is 3.0
g/m (one side) and both sides were coated.

For the surface protective layer, an aqueous gelatin solution containing, in addition to ceratin, sodium polystyrene sulfonate, fine particles of polymethyl methacrylate acid, and a hardening agent was used.

(2) Preparation of photographic material of the present invention 17.7 cc of 30% potassium bromide and 2 ceratin in 1N water
0g was added, and an aqueous solution containing silver nitrate, potassium bromide, and potassium iodide was added to the solution, which was kept at 70° C., for 30 seconds by a double jet method while stirring. Thereafter, potassium iodide was added in varying amounts as shown in Table 1, followed by an aqueous silver nitrate solution over 15 minutes, and one minute after the start of the addition, an aqueous solution containing potassium bromide and potassium iodide was added using a double-shot method. Addition started. Subsequently, ammonium hydroxide
．． After adding 5 g, an aqueous solution containing silver nitrate and potassium bromide was added over 14 minutes using a double jet method. After the addition was completed, a specified amount of nitric acid was added, the temperature was lowered to 35°C, and the solubilized salts were removed by a sedimentation method, the temperature was raised to 40°C, seratin was added, and the pH was adjusted to 5.5. In this emulsion, tabular grains with an aspect ratio of 3 or more accounted for 95% or more of the total projected area, and the tabular grains had an average aspect ratio of 5 and an average diameter of 1.2 μm.

After increasing the temperature to 57°C, 4-hydroxy 6-methyl 1,3.3a, 7-chitrazaindene and anhydro-5
,5'-di-chloro-9-ethyl-3,3'-di(3-
Sulfopropyl)oxacarbocyanine hydroxide sodium salt was added in the same amount as in (1). A coating solution was prepared by adding a coating aid and a hardening agent to this emulsion.

Using a surface protective layer similar to fil, the above-mentioned silver halide emulsion was coated on a polyethylene terephthalate support at the same time as the surface protective layer and dried to obtain photographic materials 0 to 2. The amount of silver coated and the amount of gelatin are the same as in (1).

Each of these samples was irradiated with X-rays for 0,1 sec under the conditions of a tube voltage of 80 kV and a tube current of 100 mA, and fan dome photography was performed. At this time, the screen used was GRENEX's HR-4.

After that, each sample was treated with RD-3 developer (manufactured by Fuji Film Co., Ltd.).
A roller conveyance automatic developing machine using Fuji-F fixer (manufactured by Fuji Film Co., Ltd.) with a conveyance speed of 27.8 mm/S.
, 41. By changing to 7mm/S and 55.6mm/S, the dry to dry time can be reduced to 90% each.
The processing was performed using a device that can be changed to 2 seconds, 60 seconds, and 45 seconds. At this time, the 90-second processing process was set in the same manner as the RP processing of FPM400.

Image quality was evaluated visually, including evaluation of latitude. Specifically, we visually inspected the fan dome image and evaluated the degree to which details such as fine blood vessels were visible. The processing time was evaluated by visually observing the degree of dye staining in the unexposed portion of each sample as the degree of residual color. The results are shown in Table 2.

As is clear from this table, samples ■, ■, and [phase] are dry.
Even in the quick processing of 60 seconds to dry, it is faster than the conventional 90
It can be seen that the image quality is as good as second-second processing, and the residual color level is also good. Therefore, by using the sample of the present invention, dry to dry processing of 60 seconds, which was difficult in the past, became possible.

Example 2 (11) Preparation of photographic materials Comparative photographic materials 1 to 0 were prepared in the same manner as in Example 1 (11) by changing the amount of potassium iodide added.

(2) Preparation of photographic material of the present invention Samples were prepared in the same manner as in (2) of Example 1, but by changing the amount of potassium iodide in the double jet during physical ripening, the iodine contained in the particles was By changing the amount, photographic materials O-■, 0~(0) were made.

Dry these samples in the same manner as in Example 1 (2).
To Dry processing was performed for 60 seconds, and image quality and residual color were evaluated. The results are shown in Table 3.

As is clear from this table, sample ■ has an iodine content of 2°mo1% or less.

■.

■.

■.

0° 0 gives very good results in terms of image quality and residual color.

Claims (1)

[Scope of Claims] 1) A method in which a photographic light-sensitive material having at least one silver halide emulsion layer on a support is exposed and then developed, wherein all of the silver halide grains in the silver halide emulsion layer are More than 50% of the projected area is tabular silver halide grains with an aspect ratio of 3 or more, and the total processing time (DrytoDry
) is 10 to 60 seconds, and the point of optical density 0.5 and 1.
The slope (γ_1) of the straight line connecting the points 5 is between 2.0 and 2.7, and the slope (γ_2) is between optical density 2.0 and 2.5.
1. A method for developing a silver halide photographic material, characterized in that the ratio is from 0.7 to 1.5. 2) The development processing method according to claim 1, wherein the tabular silver halide grains are silver iodobromide having an iodide content of 2.0 mol % or less.