Title: Half-life determination and comparison of activity standards of 231Pa
Authors: JEROME SIMONBOBIN C.CASSETTE P.DERSCH RAINERGALEA R.LIU HAORANGHONIG ANJAKEIGHTLEY J.KOSSERT K.LIANG JUNCHENGMAROULI MARIAMICHOTTE C.POMME STEFAANRÖTTGER STEFANWILLIAMS ROSSZHANG MING
Citation: APPLIED RADIATION AND ISOTOPES vol. 155 p. 108837
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2020
JRC N°: JRC116539
ISSN: 0969-8043 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC116539
DOI: 10.1016/j.apradiso.2019.108837
Type: Articles in periodicals and books
Abstract: The results of an international comparison of activity measurements of a solution of 231Pa are reported and analysed. Prior to this, no known standardisation of 231Pa by activity measurement had been carried out. The comparison was run in 2017–2018 involving eight laboratories, and returned results with no identifiable inconsistencies between methods or laboratories. The results, including one mass determination, gave a231Pa activity concentration of 41.461(48) kBq g−1 and a231Pa atom concentration of 61.48(23) × 1015 atoms g−1, from which a half-life value of 32 570(130) years was derived.
JRC Directorate:Nuclear Safety and Security

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