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单词 radioactive decay
释义
radioactive decay

Chemical Engineering
  • The process in which unstable atomic nuclei spontaneously lose some of their excess energy by disintegrating into more stable nuclei. This is accompanied by the emission of alpha particles, beta particles, or gamma rays. Several of the heavier radioactive elements decay through a series of unstable radioisotopes before reaching a stable end-product. It is possible, in some cases, to induce artificial radioactivity through bombardment of the nuclei with particles such as neutrons.


Geology and Earth Sciences
  • Process by which a radioactive ‘parent’ element loses elementary particles from its nucleus and in doing so becomes a stable ‘daughter’ element. The rate of decay is constant for a given element and is a very precise and accurate device for the measurement of geologic time. See also decay constant; decay curve.


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