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radioactivity
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decay of beryllium-7 decay of hafnium-180 decay of K0 meson Figure 4: The decay of a particle of mass M into two particles the sum of whose rest masses is less than M (see text). fission
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There is a vast range of the rates of radioactive decay, from undetectably slow to unmeasurably short. Before considering the factors governing particular decay rates in detail, it seems appropriate to review the mathematical equations governing radioactive decay and the general methods of rate measurement in different ranges of half-life. Radioactive decay occurs as a statistical exponential rate process. That is to say, the number of atoms likely to decay in a given infinitesimal time interval (dN/dt) is proportional to the number (N) of atoms present. The proportionality constant, symbolized by the Greek letter lambda, λ, is called the decay ...(100 of 9896 words)

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