Accurate measurements were performed of the photon emission probabilities following the α decay of235U to231Th. Sources of highly enriched235U 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.
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Marouli, M., Lutter, G., Pommé, S., Van Ammel, R., Hult, M., Richter, S., Eykens, R., Peyrés, V., García-Toraño, E., Dryák, P., Mazánová, M., & Carconi, P. (2018). Measurement of absolute γ-ray emission probabilities in the decay of. Applied Radiation and Isotopes, 132, 72 - 78. https://doi.org/10.1016/j.apradiso.2017.10.049