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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.
Gamma Rays. Gamma radiation from nuclear decay is a form of electromagnetic energy, as visible light, radio waves and X-rays are. They have very high energy compared to other types of radiation, and they have more penetrating power than X-rays; typically, lead, steel or thick concrete shielding is needed to block them.