1. Measurement of absolute γ-ray emission probabilities in the decay of 235 U
- Author
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Stephan Richter, M. Marouli, Stefaan Pommé, Mikael Hult, R. Van Ammel, Guillaume Lutter, Eduardo García-Toraño, R. Eykens, V. Peyres, P. Carconi, Monika Mazanova, Pavel Dryak, and Carconi, P.
- Subjects
Radiation ,Decay data ,235U ,Solid angle ,chemistry.chemical_element ,Germanium ,010403 inorganic & nuclear chemistry ,Mass spectrometry ,01 natural sciences ,Isotopic composition ,0104 chemical sciences ,231Th ,γ-ray spectrometry ,γ-ray emission probabilities, NORM ,010309 optics ,γ-ray emission probabilities ,NORM ,Photon emission ,chemistry ,0103 physical sciences ,Evaluated data ,Atomic physics ,γ ray spectrometry - 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. © 2017 The Authors
- Published
- 2018
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