出典:Wikipedia
出典:『Wikipedia』 (2011/04/06 04:01 UTC 版)
Plutonium-238, is a radioactive isotope of plutonium with a half-life of 87.7 years. Because it is a very powerful alpha emitter that does not emit significant amounts of other, more penetrating and thus more problematic radiation, this isotope is used for radioisotope thermoelectric generators and radioisotope heater units. One gram of plutonium-238 generates approximately 0.5 watts of power.