Title: Measurement of the 54Mn Half-Life
Authors: VAN AMMEL RafPAEPEN JanPOMME StefaanSIBBENS Goedele
Citation: APPLIED RADIATION AND ISOTOPES vol. 68 no. 12 p. 2387 - 2392
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2010
JRC N°: JRC54986
ISSN: 0969-8043
URI: www.elsevier.com/locate/apradiso
http://publications.jrc.ec.europa.eu/repository/handle/JRC54986
DOI: 10.1016/j.apradiso.2010.06.010
Type: Articles in Journals
Abstract: The half-life of 54Mn was measured by following the decay of sources from a radiochemically pure solution with three different measuring systems: an ionisation chamber, a high-purity germanium (HPGe) detector and two 7.5 cm (diameter) × 7.5 cm (height) NaI(Tl) scintillation detectors in opposite position. The measurements were performed over a period of 3 years, i.e. about 3.5 half-lives of 54Mn. The resulting half-life values and detailed uncertainty budgets are presented for the three measuring systems. The half-life obtained with the ionisation chamber, 312.32 (9) days, is consistent with but more precise than the ones obtained with the HPGe detector, 311.9 (5) days and the two NaI(Tl) detectors, 311.9 (6) days, respectively. Our final half-life value of 312.32 (9) days is rather consistent with the currently recommended values of 312.29 (26) (IAEA, 2007) and 312.13 (3) days (Helmer and Schönfeld, 2004), even though the uncertainty of the latter may be underestimated. From a partially weighted mean (Pommé and Spasova, 2008) of selected experimental values published after 1970, a new best estimate of T1/2(54Mn)=312.20 (8) days was calculated.
JRC Institute:Institute for Reference Materials and Measurements

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