Abstract: In a nuclear battery utilizing the Seebeck Effect to produce an electric voltage, a shock support system is disclosed wherein thermally conductive spring means and alignment caps support a thermoelectric converter between a heat sink and an independently supported heat source so as to cushion the converter from vibration and shock.

Abstract: An electric power generator of the type employing a nuclear heat source or the like and a thermoelectric converter is described wherein a transparent thermal insulating medium is provided inside an encapsulating enclosure to thermally insulate the heat source and thermoelectric generator. The heat source, the thermoelectric converter, and the enclosure are provided with facing surfaces which are heat-reflective to a substantial degree to inhibit radiation of heat through the medium of the encapsulating enclosure. Multiple reflective foils may be spaced within the medium as necessary to inhibit natural convection of heat and/or further inhibit radiation.