Abstract
The problem of accurate measurement of half lives is discussed, and the radioactive species are divided into three rather arbitrary groups: those which are so short lived that it is impossible to make a series of measurements of dN/ dt as a function of time by conventional counting methods; those of moderate half life where the decay can be followed over several half lives, i.e., periods of a few seconds to a few months; and those of such long half life that no large change in dN/dt occurs in a reasonable time. The first group is not covered. Some difficulties and methods involved in the second group are discussed. The third group is discussed at length. Some instruments and methods covered are ionization chambers, electroscopes, mass spectrometry, accurate weighing, isotope dililtion, calorimetric methods, and absolute alpha or BETA counting. (M.H.R.)
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