Claims
- 1. A silver halide photographic light-sensitive material comprising a silver halide photographic emulsion containing tabular silver halide twin crystal grains having a ratio of grain diameter to thickness of less than 5, wherein projection areas of said silver halide grains are 50 percent or more of total projection area of all grains; and said silver halide photographic emulsion satisfies all the following requirements (1) to (4):
- (1) said silver halide grains are monodispersed and a (grain size standard deviation/average grain size).times.100 is not more than 18;
- (2) an average silver iodide content (J.sub.1) determined by X-ray fluorometry is greater than an average value (J.sub.2) for measurements of silver iodide content taken on a diameter of a silver halide crystal at a point distanced from its center, by 80 percent of said diameter as determined by X-ray microanalysis;
- (3) for the silver iodide content of each silver halide grain determined by X-ray microanalysis, a relative standard deviation is not more than 20 percent; and
- (4) a signal exists over a range of 1.5 degrees or more of a diffraction angle at a height of a maximum peak height .times.0.13 when a diffraction pattern of a (420) face of said silver halide grains is measured with an X-ray diffractometer using CuK.alpha. ray,
- said tabular silver halide grains being prepared by mixing
- (a) a water soluble silver salt solution,
- (b) a water soluble halide solution, and
- (c) a solution containing nondispersed twin crystal silver halide seed grains,
- said mixing being conducted in the presence of silver halide grains having a solubility product smaller than that of silver halide grains growing from said seed grains to said tabular silver halide grains at the time of said mixing.
- 2. A silver halide photographic material of claim 1, wherein said ratio of grain diameter to thickness is within the range of 1.1 to 5.
- 3. A silver halide photographic material of claim 1, wherein said silver halide photographic emulsion comprises silver iodobromide having a silver iodide content of 4 to 20 mol %.
- 4. A silver halide photographic material of claim 1, wherein in (4), said (420) diffraction pattern has 2 or 3 peaks.
- 5. A silver halide photographic material of claim 1, wherein said silver halide photographic emulsion satisfies a requirement wherein the average silver iodide content (J.sub.1) obtained by X-ray fluorometry and the grain surface silver iodide content (J.sub.3) obtained by X-ray photoelectron spectrometry bear the relationship of J.sub.1 >J.sub.3.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-39004 |
Feb 1990 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 655727, filed Feb. 14, 1991, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (6)
Number |
Date |
Country |
165576 |
Dec 1985 |
EPX |
263507 |
Apr 1988 |
EPX |
309119 |
Mar 1989 |
EPX |
323215 |
Jul 1989 |
EPX |
326853 |
Aug 1989 |
EPX |
3310609 |
Oct 1983 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
655727 |
Feb 1991 |
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