• high specific thermal power, resulting from alpha-decay and high specific activity; • non-fissionable under all conditions of mass and configuration; • 87.6 year half-life, providing a long-term source of power; • insolubility of the dioxide form; and • ceramic nature of the fuel. Early in the Galileo program, a study assessed methods of improving the safety and operational characteristics of the RTG heat-source materials by using an improved high-purity carbon material single-cylinder/end caps structure.
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