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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 is a radioactive metallic element with the atomic number 94. It was discovered in 1940 by scientists studying how to split atoms to make atomic bombs.Plutonium is created in a reactor when uranium atoms absorb neutrons. Nearly all plutonium is man-made.Plutonium predominantly emits alpha particles â a type of radiation that is easily stopped and has a short range. It also emits neutrons, beta particles and gamma rays.lutonium is created in a reactor when uranium atoms absorb neutrons. Nearly all plutonium is man-made. Plutonium predominantly emits alpha particles â a type of radiation that is easily stopped and has a short range. It also emits neutrons, beta particles and gamma rays.