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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.
Radioactive elements produce some radiation in the form of neutrons and alpha and beta particles. Heavier elements such as uranium emit neutrons when they split to form lighter elements. Some radioactive substances emit alpha particles, which are helium nuclei -- two neutrons and two protons.