Patent ID: 7235352

Claim:
A photothermographic material comprising a support including on one surface thereof at least a photosensitive silver halide grain having core portion and shell portion, a non-photosensitive organic silver salt, a reducing agent for reducing silver ions and a binder, wherein the photosensitive silver halide grain 1) has a silver iodide content ranging from 10 mol % to 100 mol % and 2) includes metal pairs of a first and a second metal selected from metal pairs consisting of Ir—Fe, Ir—Cu, Ru—Cu, Ru—Fe, Fe—Os, Fe—Ru, Fe—Cu, Fe—Pt, Os—Cu, Os—Fe, Cu—Fe and Cu—Ru wherein the first metal of the metal pair is distributed in said core portion and the second metal of the metal pair is distributed in said shell portion.