Abstract:
Atomic diode battery or thermionic converter including a radioisotopic fuel pellet enclosed in a capsule having an emitter surface extending over substantially the entire capsule external area, a housing enclosing the emitter capsule and having an internal collector surface extending over substantially the entire housing internal area and maintained at a predetermined spacing from the emitter surface, a cesium vapor source communicating with the interelectrode space under such low vapor pressure as to effect nominally vacuum mode operation, and emitter and collector connections providing an electrical output from the battery. An optimum relationship established among battery parameters provides maximum energy conversion efficiency at practical electrode temperatures and spacings using available materials.
Abstract:
Low temperature radioisotopic thermionic converter having a construction wherein the converter adsorption area to vapor volume ratio is sufficiently high at the converter''s operating pressure to achieve an area-dominated adsorption effect structure, is processed by first refluxing cesium at high collector temperature and high vapor pressure in the converter to purge remanent reactive impurities therein and then establishing the loci of converter maximum power versus cesium reservoir temperature for respectively different collector temperatures to allow adjustment of the converter at optimum cesium pressure and optimum collector temperature before sealing. Cesiation apparatus for batch-charging of a plurality of converters from a common cesium supply source includes a heated cesium reservoir container for enclosing the converters therein, and a collector heater, emitter and collector connection leads, and a means of sealing each converter at each converter position.