A new measurement of the (241)Pu half-life by isotope mass spectrometry
The half-life of (241)Pu for beta decay has been determined on an initially 93% isotopically enriched material by measuring the decreasing amount ratio n((241)Pu)/n((240Pu) as a function of time over more then twenty years. Over the same period the decrease of this ratio was measured relative to the amount ratio n((240)Pu)/n((239)Pu) in a ratio-of-ratio measurement which allowed for correction of isotopic effects in the ion source taking into account the decay of (240)Pu (half-life = 6553 a) and (239)Pu (half-life = 24 110 a). A regression procedure of the ratio-of-ratio measurements as a function of time resulted in a value for the (241)Pu half-life of 14.290 +/- 0.006 a (expanded uncertainty with a coverage factor k = 2). The slight difference found in the half-life value measured on the same material in the period 1976-1981 is discussed.
Bibliographic Reference: Article: Nuclear Instruments and Methods
Record Number: 199810585 / Last updated on: 1998-05-12
Original language: en
Available languages: en