Measurement of the 171Tm half-life

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  • PSI - Paul Scherrer Institute
  • EC - JRC - European Commission - Joint Research Centre

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The half-life of 171Tm was measured by gamma-ray spectrometry, using the reference source method. The measured point-like source was prepared by homogenous mixing of 44Ti with 171Tm in order to obtain an identical detection geometry for both nuclides. The half-life of 171Tm was determined by following the count-rate ratio between the gamma-ray emissions at 66.73 keV (171Tm) and 67.9/78.3 keV (44Ti). The measurement campaign consisted of 280 measurements acquired over a period of 449 days, corresponding to about 60% of the half-life value. The result for the 171Tm half-life, 702.4 (70) d, is consistent with the currently recommended value, however the uncertainty assessment of the latter is poorly documented.


Original languageEnglish
Pages (from-to)645-653
Number of pages9
JournalJournal of Radioanalytical and Nuclear Chemistry
Issue number1
Publication statusPublished - Jan 2022


  • Half-life, Uncertainty, 171Tm, Nuclear data, S-process

ID: 7323942