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New determination of the 229Th half-life

Published

Author(s)

Richard M. Essex, Jacqueline L. Mann, Ronald Colle, Lizbeth Laureano-Perez, Megan E. Bennett, Heather Dion, Ryan P. Fitzgerald, Amy M. Gaffney, Amelie Hubert, Rob 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

Keywords

229Th, half-life, liquid scintillation counting, NaI counting, isotope dilution alpha spectrometry

Citation

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(01234567 (Accessed October 19, 2021)
Created July 24, 2018, Updated November 10, 2018