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dc.contributor.authorCOLLINS S.en_GB
dc.contributor.authorPOMME Stefaanen_GB
dc.contributor.authorJEROME S. M.en_GB
dc.contributor.authorFERREIRA K. M.en_GB
dc.contributor.authorREGAN P. H,en_GB
dc.contributor.authorPEARCE A.en_GB
dc.date.accessioned2015-08-29T00:03:37Z-
dc.date.available2015-08-28en_GB
dc.date.available2015-08-29T00:03:37Z-
dc.date.created2015-08-21en_GB
dc.date.issued2015en_GB
dc.date.submitted2015-03-19en_GB
dc.identifier.citationAPPLIED RADIATION AND ISOTOPES vol. 104 p. 203-211en_GB
dc.identifier.issn0969-8043en_GB
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0969804315300828en_GB
dc.identifier.urihttp://publications.jrc.ec.europa.eu/repository/handle/JRC95245-
dc.description.abstractUtilising a chemically purified solution the radioactive half-life of 227Th has been determined indirectly by observation of the ingrowth of 223Ra using an ionisation chamber (IC) and for the first time by direct observation of the change in activity with time using a high-purity germanium (HPGe) gamma-ray spectrometer. The radioactive decay was observed for ~ 104 days (~ 5.6 half-lives) by gamma-ray spectrometry and approximately 63 days and 72 days (~ 3.4 and ~ 3.9 half-lives) using an ionisation chamber (IC). The resulting half-life values – 18.695 (4) days (IC) and 18.683 (20) days (HPGe) – are consistent and detailed uncertainty budgets are presented for the two measurement techniques. The weighted mean of both results, 18.695 (4) days, is inconsistent with the most precise published half-life value of 18.7176 (52) days (Jordan and Blanke, 1967). A critical evaluation of literature data has been performed, indicating a paucity of reliable and independent measurements. The power-moderated weighted mean of selected independent published values is T1/2(227Th) = 18.697 (7) days. A method has been provided for modification of the estimated half-life of 227Th, determined by the ingrowth technique, in this work if a different evaluated 223Ra half-life would be used.en_GB
dc.description.sponsorshipJRC.D.4-Standards for Nuclear Safety, Security and Safeguardsen_GB
dc.format.mediumOnlineen_GB
dc.languageENGen_GB
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDen_GB
dc.relation.ispartofseriesJRC95245en_GB
dc.titleThe half-life of 227Th by direct and indirect measurementsen_GB
dc.typeArticles in periodicals and booksen_GB
dc.identifier.doi10.1016/j.apradiso.2015.07.001en_GB
JRC Directorate:Health, Consumers and Reference Materials

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