Title: Conversion electron spectroscopy of the 59.54 keV transition in 241Am alpha decay
Authors: POMME STEFAANPAEPEN JANMAROULI MARIA
Citation: APPLIED RADIATION AND ISOTOPES vol. 153 p. 108848
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2019
JRC N°: JRC116273
ISSN: 0969-8043 (online)
URI: https://www.sciencedirect.com/science/article/pii/S0969804319303872?via%3Dihub
https://publications.jrc.ec.europa.eu/repository/handle/JRC116273
DOI: 10.1016/j.apradiso.2019.108848
Type: Articles in periodicals and books
Abstract: A windowless Peltier-cooled silicon drift detector (SDD) was used to measure internal conversion electron (ICE) spectra of thin 241Am sources. The ICE peaks associated with the 59.54 keV gamma transition in 237Np were deconvoluted and relative ICE intensities were derived from the fitted peak areas. Corrections were made for energy dependence of the full-energy-peak counting efficiency, based on Monte Carlo simulations. As expected for this anomalous E1 transition, a significant discrepancy was found with the theoretical internal conversion coefficient (ICC) values calculated from the BrIcc database. Penetration effects are known to cause such anomalies in highly retarded transitions. The measured ICE intensities are in good agreement with a specific combination of literature data obtained with magnetic spectrometers.
JRC Directorate:Nuclear Safety and Security

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