| 摘要 |
The present invention provides a silver salt particle of a nitrogen-containing heterocyclic compound having a shape of A or B, and a photothermographic material including at least a photosensitive silver halide, a non-photosensitive organic silver salt, and a reducing agent, wherein the non-photosensitive organic silver salt is a silver salt particle of a nitrogen-containing heterocyclic compound having the shape of A or B: A) a rectangular particle in which a major axis <U STYLE="SINGLE">a, a medium axis <U STYLE="SINGLE">b, and a minor axis <U STYLE="SINGLE">c of the rectangle satisfy <U STYLE="SINGLE">a>=<U STYLE="SINGLE">b, and a ratio of the medium axis <U STYLE="SINGLE">b to the minor axis <U STYLE="SINGLE">c (<U STYLE="SINGLE">b/<U STYLE="SINGLE">c) is from 1.1 to 10; B) a rod-like particle in which a cross section of the rod is circular or elliptic, and a major axis d of the rod and an equivalent circular diameter e of the cross section of the rod satisfy d/e>2.
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