Abstract
The emission probability P α1 for the 5.449-MeV α particles, which in the decay of 224Ra populate the 241-keV level in 220Rn, was measured using 224Ra sources by recoil implantation from 228Th and Si surface-barrier detectors. Additionally, the 241-keV γ-ray emission probability, P γ(241) was measured using 228Th sources and a calibrated high-purity Ge detector. A pair of deduced values, P γ(241) , P α1 , was obtained from the measured data of P α1 and P γ(241) , respectively. The weighted mean of the measured and deduced data yielded the results of P α1 = 0.0507 ± 0.0005 and P γ(241) = 0.0400 ± 0.0007. The quoted overall uncertainties correspond to the 68% confidence limits for the mean with an effective number of degrees of freedom equal 5.
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