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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.
The radiation one typically encounters is one of four types: alpha radiation, beta radiation, gamma radiation, and x radiation. Neutron radiation is also encountered in nuclear power plants and high-altitude flight and emitted from some industrial radioactive sources. Alpha radiation is a heavy, very short-range particle and is actually an ejected helium nucleus. 2  Some characteristics of alpha radiation are: 3  Examples of some alpha emitters: radium, radon, uranium, thorium. 4  Most alpha radiation is not able to penetrate human skin.