Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..168a&link_type=abstract
Earth and Planetary Science Letters, Volume 78, Issue 2-3, p. 168-176.
Physics
37
Scientific paper
Beta rays from a 32Si-32P source, produced in 1968-1969 via the 30Si(t,p)32Si reaction using a Van de Graaff beam at Et = 3.4 MeV, were counted with an end-window gas-flow proportional counter system including an automatic precision sample changer. Comparison counts were taken on the β rays from a 36Cl source. Measurements beginning February, 1982 were made at approximately 4-week intervals, each consisting of a total of 40 hours of counting on each sample. The decay rate was determined from the 32Si/36Cl ratio of counts. Small periodic annual deviations of the data points from an exponential decay curve were observed, but are of uncertain origin and had no significant effect on the result. Based on the analysis of 53 points taken in 48 months, the value T1/2 = 172(4) yr is adopted for the half-life of 32Si. This result is substantially greater than two previously reported measurements of 108(18) yr and 101(18) yr but is lower than values based on geophysical evidence.
Alburger D. E.
Harbottle G.
Norton E. F.
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