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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.
Radioactivity usually results from nuclear reactions, that is, reactions which involve the. breaking of nuclear bonds having energies of the order of 106 eV = 1MeV. The three most. common types of radioactive emissions are: alpha rays: Î± rays or Î± particles are high-energy helium nuclei (2 protons + 2 neutrons), which. are spontaneously emitted during the decay of radioactive nuclei. Î±-rays are extremely. dangerous, but, fortunately, they have very little penetrating power.