Patent ID: 7192694

Claim:
A photothermographic material containing, on a substrate, at least a photosensitive silver halide having an average particle size of 5 nm to 40 nm, a non-photosensitive organic silver salt comprising silver behenate in an amount of 40 mol % to 99 mol %, a reducing agent which contains a compound represented by general formula (R): in which R 11 and R 11′ each represents independently an alkyl group of 1 to 20 carbon atoms, R 12 and R 12′ each represents independently an alkyl group of 1 to 20 carbon atoms, L represents an —S— group or —CHR 13 — group, R 13 represents a hydrogen atom or an alkyl group of 1 to 20 carbon atoms, and X 1 and X 1′ each represents independently a hydrogen atom or a group capable of substitution on a benzene ring, and a binder in which the total silver iodide content of the photosensitive silver halide is 90 mol % to 100 mol %, and the coating amount of photosensitive silver halide in terms of an amount of silver is 0.005 g/m 2 to 0.05 g/m 2 wherein in the photosensitive silver halide is formed in a state where the non-photosensitive organic salt is not present and wherein the average γ-phase ratio of the photosensitive silver halide is 5 mol % to 90 mol %.