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24 For a radioisotope that can decay into more than one daughter atom, we may relate the number of atoms of a particular daughter at time t in terms of the initial number of atoms of the "daughter" species, ND0, and the fraction, a, of N that decays into that particular daughter atom of interest by

Equation (4.20) is often divided by the number of atoms of a stable, abundant isotope of the daughter element, NDs, so that the number of daughter atoms produced by radioactive decay can be obtained relative to that isotope, by the techniques of mass spectroscopy. Thus, (4.20) may be rewritten

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