Title: Direct measurement of alpha emission probabilities in the decay of 226Ra
Authors: MAROULI MARIAPOMME STEFAANVAN AMMEL RAFGARCIA-TORANO E.CRESPO M. T.PIERRE S.
Citation: APPLIED RADIATION AND ISOTOPES vol. 125 p. 196 - 202
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2017
JRC N°: JRC105816
ISSN: 0969-8043
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC105816
DOI: 10.1016/j.apradiso.2017.04.029
Type: Articles in periodicals and books
Abstract: High-resolution alpha-particle spectrometry was performed to determine the main alpha-particle emission probabilities in the decay of 226Ra. Thin, homogeneous sources were prepared by electrodeposition on stainless steel disks. Alpha spectra with an energy resolution of 20 keV were obtained in three laboratories and analysed with different deconvolution algorithms. In two set-ups, a magnet system was used to deflect conversion electrons to avoid their coincidental detection with the alpha particles. Spectra taken at close range without a magnet system yielded biased results which cannot be fully compensated by mathematical corrections for coincidence summing. The derived emission probabilities of the three main alpha decays are 94.07 (1) %, 5.93 (1) %, and 0.0059 (15) %, respectively. They are in excellent agreement with calculated values derived from the P(gamma+ce) decay scheme balance, which solves the existing discrepancy problem with two previous direct measurements published in literature.
JRC Directorate:Nuclear Safety and Security

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