| 摘要 |
PROBLEM TO BE SOLVED: To obtain a heat-developable photosensitive material freed of opacification and superior in sharpness by incorporating an organic silver salt having an average corresponding circle diameter not exceeding a specified value. SOLUTION: The heat-developable photosensitive material contains an organic silver salt having an average corresponding circle diameter of <=350 nm and the variation coefficient of this circle diameter is <=50% and this diameter is expressed by the diameter of the corresponding circle of the projected grain and the tendency of opecification can be greatly restrained by regulating its average value to 0.35μm. It is necessary to control the average corresponding circle diameter to a specified value in order to greatly restrain opacification and to obtain a superior image, but further, it is preferred to control its average value to <=0.1μm, furthermore, 0.01-0.1μm, especially, 0.02-0.08μm.
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