Abstract

A graded structure with multiple functions is required to construct a radioisotope (RI) heat source for a new energy generating thermoelectric conversion system. The first function is to obtain as high a surface temperature of the heat source structures as possible, and another function is a radiation shielding function. This structure is a cylinder, composed of RI-SrTiO3 as a heat source and BN as a radiation-shielding material. The composite RI cylinder must be designed to maximize the surface temperature and to minimize the radiation intensity on the cylindrical surface. It is proposed that an optimum graded distribution of RI-SrTiO3 exists which satisfies the two distinct requirements.

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