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- W2243297588 abstract "The $^{239}mathrm{Pu}$ half-life was measured both by $ensuremath{alpha}$ counting with an intermediate geometry proportional counter and by mass spectrometric measurements of the rate of $^{235}mathrm{U}$ formation, using isotopic dilution with titrated $^{233}mathrm{U}$ and $^{238}mathrm{U}$ spikes. The plutonium concentration was measured by oxidation-reduction titration, using NBS-certified plutonium as a reference standard. The results from the two measurements were statistically consistent and their average gives for the $^{239}mathrm{Pu}$ half-life the value 24131 ifmmodepmelsetextpmfi{} 16 yr, corresponding to a specific activity of (1.3758 ifmmodepmelsetextpmfi{} 0.0009) ifmmodetimeselsetexttimesfi{} ${10}^{11}$ dis/min per gram $^{239}mathrm{Pu}$ (one standard deviation error). This result agrees with some recent measurements, but is in marked disagreement with a number of earlier ones.[RADIOACTIVITY $^{239}mathrm{Pu}$ half-life, specific activity; measured: $ensuremath{alpha}$ activity, intermediate geometry $ensuremath{alpha}$ counter; $^{235}mathrm{U}$ growth rate, isotope dilution and mass spectrometer; plutonium concentration, titration.]" @default.
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- W2243297588 date "1977-07-01" @default.
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- W2243297588 title "Half-life ofPu239by two independent methods" @default.
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- W2243297588 doi "https://doi.org/10.1103/physrevc.16.354" @default.
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