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Radioisotope heater unit
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==GPHS== The [[United States Department of Energy]] has developed the [[general-purpose heat source]] (GPHS) primarily for space use. These GPHSs can be used individually or in groups of up to eighteen for component heating, but are primarily used as the heat source for RTGs. Each GPHS contains four [[iridium]]-clad Pu-238 fuel pellets, standing 5 cm tall, 10 cm square and weighs 1.44 kg.
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