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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 (pronounced /pluËËtoÊniÉm/) is a rare radioactive, metallic and toxic chemical element. It has th â¦ e symbol Pu and the atomic number 94. It is a fissile element used in most modern nuclear weapons. The most significant isotope of plutonium is 239Pu, with a half-life of 24,100 years.he radioactive metal plutonium is a rare-earth actinide from period 7 of the periodic table.