Importance

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Abstract

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: 300.gtoreq.S(.lambda. max)/S(.lambda. max+30 nm).gtoreq.4.5 Formula (1) 30.gtoreq.S(.lambda. max)/S(.lambda. max-30 nm).gtoreq.2 Formula (2) 300.gtoreq.Abs.(.lambda. max)/Abs.(.lambda. max-30 nm).gtoreq.4.5 Formula (3) 30.gtoreq.Abs.(.lambda. max)/Abs.(.lambda. max-30 nm).gtoreq.2 Formula (4) wherein, in the above formulas, .lambda.max denotes maximum spectral sensitivity wavelength, Abs.(.lambda.) denotes optical density at a wavelength of .lambda. and S(.lambda.) denotes spectral sensitivity at a wavelength of .lambda.. 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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First Claim