New determination of the 229Th half-life
- Essex, Richard
- Mann, Jacqueline
- Colle, Ronald
- Laureano-Perez, Lizbeth
- Bennett, Megan
- Dion, Heather
- Fitzgerald, Ryan
- Gaffney, Amy
- Gourgiotis, Alkiviadis
- Hubert, Amelie
- Inn, Kenneth
- Kinman, William
- Lamont, Stephen
- Steiner, Robert
- Williams, Roos
Publication date
October 2019
DOI Publisher
Springer Science and Business Media LLCAbstract
International audienceA new determination of the 229Th half-life was made based on measurements of the 229Th massic activity of a high-purity solution for which the 229Th molality had previously been measured. The 229Th massic activity was measured by direct comparison with SRM 4328C using 4παβ liquid scintillation counting, NaI counting, and standard addition liquid scintillation counting. The 229Th massic activity was confirmed by isotope dilution alpha spectrometry measurements. The 229Th half-life calculated from the activity measurements is (7825 ± 87) years (k = 2)
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