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Plutonium-238 has a half-life of 88 years and emits alpha particles. It is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.
Of this total, about 33 mrem/yr is due to external ionizing radiation from cosmic rays, about 21 mrem/yr is due to external radiation from terrestrial gamma rays, and radionuclides within the body (principally Potassium-40) contributing about 29 mrem/yr.