| 摘要 |
Disclosed is a photothermographic material containing a non-photosensitive silver salt and a photosensitive silver halide on a support, wherein the photosensitive silver halide is spectrally sensitized with a spectral sensitizing dye so that maximum spectral sensitivity wavelength could become longer than 730 nm and the conditions defined by the following formulas (1) and (2) and/or the conditions defined by the following formulas (3) and (4) could be satisfied:wherein, in the above formulas, lambdmax denotes maximum spectral sensitivity wavelength, Abs.(lambd) denotes optical density at a wavelength of lambd and S(lambd) denotes spectral sensitivity at a wavelength of lambd. The photothermographic material of the present invention can form images with low fog and shows little increase of fog and sensitivity fluctuation during storage before light exposure.
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