1. A photothermographic material comprising a support having thereon one or more layers comprising a binder and in reactive association: a. a preformed photosensitive silver halide, b. a non-photosensitive source of reducible silver ions, C. a reducing composition for said reducible silver ions, and d. a tellurium chemical sensitizer represented by the following Structure I or II: Te(L) m (X 1 ) n I Pd(X 2 ) 2 &lsqb;Te(R′) 2 &rsqb; 2 II wherein X 1 and x 2 independently represent halo, OCN, SCN, S(C&equals;S)N(R a )(R b ), S(C&equals;S)OR a, S(C&equals;S)SR a, S(P&equals;S)(OR a )(OR b ), S(P&equals;S)(R a )(R b ), SeCN, TeCN, CN,SR a, OR a, N 3, alkyl, aryl, or O(C&equals;O)R a groups, R a and R b are an alkyl, alkenyl, cycloalkyl, heterocycyl, or aryl group, or R a and R b taken together can form a 5-, 6- or 7-membered heterocyclic ring, L is a ligand derived from a neutral Lewis base, R′ is an alkyl or aryl group, m is 0, 1, 2, or 4, and n is 2 or 4 provided that when m is 0 or 2, n is 2 or 4, and when m is 1 or 4, n is 2, and further provided that multiple X 1, X 2, L, R a, R b, or R′ groups in the molecule can be the same or different.