Title: Measurement of the 225Ac half-life
Authors: POMME StefaanMAROULI MARIASULIMAN GABRIELDIKMEN HASANVAN AMMEL RafJOBBAGY VIKTORDIRICAN A.STROH HEIKOPAEPEN JanBRUCHERTSEIFER FrankAPOSTOLIDIS ChristosMORGENSTERN Alfred
Citation: APPLIED RADIATION AND ISOTOPES vol. 70 no. 11 p. 2608-2614
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2012
JRC Publication N°: JRC70908
ISSN: 0969-8043
URI: http://www.sciencedirect.com/science/article/pii/S0969804312004472
http://publications.jrc.ec.europa.eu/repository/handle/JRC70908
DOI: 10.1016/j.apradiso.2012.07.014
Type: Articles in Journals
Abstract: The (225)Ac half-life was determined by measuring the activity of (225)Ac sources as a function of time, using various detection techniques: α-particle counting with a planar silicon detector at a defined small solid angle and in a nearly-2π geometry, 4πα+β counting with a windowless CsI sandwich spectrometer and with a pressurised proportional counter, gamma-ray spectrometry with a HPGe detector and with a NaI(Tl) well detector. Depending on the technique, the decay was followed for 59-141d, which is about 6-14 times the (225)Ac half-life. The six measurement results were in good mutual agreement and their mean value is T(1/2)((225)Ac)=9.920 (3)d. This half-life value is more precise and better documented than the currently recommended value of 10.0d, based on two old measurements lacking uncertainty evaluations.
JRC Institute:Institute for Reference Materials and Measurements

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