| 摘要 |
A photothermographic material comprising a support having thereon a photosensitive layer comprising non-photosensitive organic silver salt grains, photosensitive silver halide grains, a binder, a cross-linking agent, and a reducing agent,wherein a silver coverage in the photosensitive layer is from 0.3 to 2.0 g/m2; the number of developed silver halide grains N1 in the maximum density area is from 5x1013 to 1x1015/m2 when the photothermographic material is subjected to exposure in an exposure amount of 280 muJ/cm2 and subsequently is subjected to heat development at 123° C. for 16.5 seconds; and, in the maximum density area, the number of developed silver halide grains N1 and the number of undeveloped silver halide grains N2 satisfy the formula; 0.70<=N1/(N1+N2)<=0.95.
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