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单词 decay
释义 decay
The spontaneous transformation of one radioactive nuclide into a daughter nuclide, which may be radioactive or may not, with the emission of one or more particles or photons. The decay of No nuclides to give N nuclides after time t is given by
N = N0exp(-γt)
, where γ is called the decay constant or the disintegration constant . The reciprocal of the decay constant is the mean life . The time required for half the original nuclides to decay (i.e.
NN0
) is called the half-life of the nuclide. The same terms are applied to elementary particles that spontaneously transform into other particles. For example, a free neutron decays into a proton and an electron (see beta decay). See also alpha particle; Q-value
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