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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.
Plutonium-238 is a special material that emits steady. heat due to its natural radioactive decay. Several unique. features of plutonium-238 have made it the material of. choice to help produce electrical power for more than. two-dozen U.S. space missions that have been enabled. by radioisotope power systems (RPS).