The half-life of 145Sm has been measured by means of the reference source method with a HPGe detector. The long-lived radionuclide 44Ti was mixed into the source for reference. The time-dependency of the 145Sm/44Ti activity ratio was followed by assessing the count-rate ratio of their characteristic gamma-ray emissions at 61.2 keV (145Sm) and 67.9/78.3 keV (44Ti) in spectra recorded over periods of typically one day. In total, 220 measurements were performed over a period of 384 days or about one half-life period. The experiment and ensuing uncertainty budget are discussed in detail. Different error propagation is applied for random un-certainties, autocorrelated structures in the fit residuals, and potential systematic errors. The result for the 145Sm half-life, 345 (16) d, is compatible with the scarce literature values, however the experimental details of the old measurements were barely documented.
KAJAN Ivan;
POMME Stefaan;
PELCZAR Krzysztof;
HEINITZ Stephan;
2021-10-19
PERGAMON-ELSEVIER SCIENCE LTD
JRC123974
0969-8043 (online),
https://www.sciencedirect.com/science/article/pii/S0969804321003742,
https://publications.jrc.ec.europa.eu/repository/handle/JRC123974,
10.1016/j.apradiso.2021.109978 (online),
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