Title: A New Measurement of the 241-Pu Half-Life Using Isotope Mass Spectrometry.
Authors: DE BIEVRE Paul jan cyrielVERBRUGGEN Andre leo
Citation: Metrologia vol. 36 p. 25-31
Publication Year: 1999
JRC N°: JRC15922
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC15922
Type: Articles in Journals
Abstract: The half-life of 241-Pu for beta decay has been determined on an iniyially 93% isotopically enriched material by measuring the decreasing amount ratio n(241Pu)/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(240Pu)/n (239 Pu) in a ratio-of-ratio measurement which allowed for correction of isotopic effects in the ion source whilst decay of 240-Pu (half-life=6553 a) and 239-Pu (half-life=24 110 a) were taken into account. The resulting value for the 241-Pu half-life is 14.290+- 0.006 a (expanded uncertainty with coverage factor k=2). The slight difference found with the half life value as measured by us on the same material in the period 1976- 1981 is discussed.
JRC Institute:Institute for Reference Materials and Measurements

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