Abstract
The determination of 241Pu is important in elucidating the isotopic composition of any Pu sample. The relatively short half-life (14.32 yr) of 241Pu leads to inconsistency in the correlations involving this isotope unless the different Pu samples have either the same irradiation and cooling history or the exact cooling period is known to account for the decay of 241Pu prior to using the data for developing isotope correlations. To overcome this limitation, a useful correlation based on the measurement of total β/total α activity of Pu sample using liquid scintillation counting method was developed. Total β/total α activity of the Pu sample is correlated to the 241Pu/ 239Pu atom ratio and thus does not depend upon the knowledge of the cooling period. For any unknown sample, the 241Pu/ 239Pu atom ratio can be determined by using the developed correlation and by measuring, using a liquid scintillation counter, the total β/total α activity of purified Pu sample.
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