Title: Measurement of absolute γ-ray emission probabilities in the decay of 235U
Authors: MAROULI MARIALUTTER GUILLAUMEPOMME STEFAANVAN AMMEL RAFHULT MIKAELRICHTER STEPHANEYKENS ROGERPEYRES VIRGINIAGARCIA-TORANO E.DRYAK P.MAZANOVA M.CARCONI P.
Citation: APPLIED RADIATION AND ISOTOPES vol. 132 p. 72-78
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2018
JRC N°: JRC108321
ISSN: 0969-8043
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC108321
DOI: 10.1016/j.apradiso.2017.10.049
Type: Articles in periodicals and books
Abstract: Accurate measurements were performed of the photon emission probabilities following the α decay of 235U to 231Th. Sources of highly enriched 235U were characterised in terms of isotopic composition by mass spectrometry and their activities were standardised by means of alpha-particle counting at a low defined solid angle. The standardised sources were subsequently measured by high-resolution γ-ray spectrometry with calibrated high-purity germanium detectors to determine the photon emission probabilities. Four laboratories participated in this work and reported emission probabilities for 33 γ-ray lines. Most of them agree with previously published evaluated data. In addition, new values are proposed for γ-lines which have been measured only once in the past.
JRC Directorate:Nuclear Safety and Security

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