New determination of the 229Th half-life

Essex, Richard M.; Mann, Jacqueline L.; Collé, Ronald; Laureano-Perez, Lizbeth; Bennett, Megan E.; Dion, Heather; Fitzgerald, Ryan; Gaffney, Amy M.; Gourgiotis, Alkiviadis; Hubert, Amélie; Inn, Kenneth G.  W.; Kinman, William S.; Lamont, Stephen P.; Steiner, Robert; Williams, Ross W.

doi:10.1007/s10967-018-6032-9

Title: New determination of the ²²⁹Th half-life

Journal Article · 23 July 2018 · Journal of Radioanalytical and Nuclear Chemistry

DOI: https://doi.org/10.1007/s10967-018-6032-9 · OSTI ID:1497940

^[1]; Mann, Jacqueline L. ^[1]; Collé, Ronald ^[1]; Laureano-Perez, Lizbeth ^[1]; Bennett, Megan E. ^[2]; Dion, Heather ^[3]; Fitzgerald, Ryan ^[1]; Gaffney, Amy M. ^[4]; Gourgiotis, Alkiviadis ^[5]; Hubert, Amélie ^[6]; Inn, Kenneth G. W. ^[7]; Kinman, William S. ^[3]; Lamont, Stephen P. ^[3]; Steiner, Robert ^[3]; Williams, Ross W. ^[4]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Shine Medical Technologies, Janesville, WI (Untied States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Inst. for Radiological Protection and Nuclear Safety (IRSN), Fontenay-aux-Roses (France)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
K & E Innovations, Ewa Beach, HI (United States)

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 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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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1497940

Alternate ID(s):: OSTI ID: 22755121

Report Number(s):: LLNL-JRNL--756361; {942601,"Journal ID: ISSN 0236-5731"}

Journal Information:: Journal of Radioanalytical and Nuclear Chemistry, Journal Name: Journal of Radioanalytical and Nuclear Chemistry Journal Issue: 1 Vol. 318; ISSN 0236-5731

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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