P De Bièvre and A Verbruggen 1999 Metrologia 36 25 doi:10.1088/0026-1394/36/1/5
P De Bièvre and A Verbruggen
Show affiliationsThe half-life of 241Pu for β decay has been determined on an initially 93 % isotopically enriched material by measuring the decreasing amount ratio n(241Pu)/n(240Pu) as a function of time over more than twenty years. Over the same period the decrease of this ratio was measured relative to the amount ratio n(240Pu)/n(239Pu) in a "ratio-of-ratio" measurement which allowed for correction of isotopic effects in the ion source, taking into account the decay of 240Pu (half-life = 6553 a) and 239Pu (half-life = 24110 a). A regression procedure of the ratio-of-ratio measurements as a function of time resulted in a value for the 241Pu half-life of (14.290 ± 0.006) a (expanded uncertainty with coverage factor k = 2). The slight difference found in the half-life value as measured by the authors on the same material in the period 1976 to 1981 is discussed.
23.40.-s Beta decay; double beta decay; electron and muon capture
Issue 1 (February 1999)
P De Bièvre and A Verbruggen 1999 Metrologia 36 25
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