Measurement of absolute γ-ray emission probabilities in the decay of 235U. (February 2018)

• Record Type: Journal Article
• Authors: 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.
• Is Part Of: Applied radiation and isotopes. Volume 132(2018:Feb.)
• Page Start: 72
• Page End: 78
• Publication Date: 2018-02
• Subjects: γ-ray spectrometry -- 235U -- 231Th -- Decay data -- γ-ray emission probabilities, NORM; Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2017.10.049
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: Accurate measurements were performed of the photon emission probabilities following the α decay of 235 U to 231 Th. Sources of highly enriched 235 U 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. Highlights: Measured gamma-ray emission probabilities per decay of 235 U. Mean values taken from 4 laboratories. Source activity determined by primary standardisation and mass spectrometry. Results reported for 33 γ-ray lines. Generally in good agreement with literature values.