Essex, R.
, Mann, J.
, Colle, R.
, Laureano-Perez, L.
, Bennett, M.
, Dion, H.
, Fitzgerald, R.
, Gaffney, A.
, Hubert, A.
, Steiner, R.
, Williams, R.
, Gourgiotis, A.
and Kinman, W.
(2018),
New determination of the 229Th half-life, Journal of Radioanalytical and Nuclear Chemistry, [online], https://doi.org/10.1007/s10967-018-6032-9
(Accessed October 13, 2025)
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New determination of the 229Th half-life
Published
Author(s)
, , , , Megan E. Bennett, Heather Dion, , Amy M. Gaffney, Amelie Hubert, Robert E. Steiner, Ross W. Williams, Alkiviadis Gourgiotis, William S. Kinman
Abstract
A 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 4 pi-alpha-beta; 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).Citation
Journal of Radioanalytical and Nuclear Chemistry
Pub Type
Journals
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Keywords
229Th, half-life, liquid scintillation counting, NaI counting, isotope dilution alpha spectrometry
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Created July 23, 2018, Updated August 17, 2022