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Title: New determination of the 229Th half-life

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 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).

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [3];  [1];  [4];  [5];  [6];  [7];  [3];  [3];  [3];  [4]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  2. Shine Medical Technologies, Janesville, WI (Untied States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Inst. for Radiological Protection and Nuclear Safety (IRSN), Fontenay-aux-Roses (France)
  6. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  7. K & E Innovations, Ewa Beach, HI (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1497940
Report Number(s):
LLNL-JRNL-756361
Journal ID: ISSN 0236-5731; 942601
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Radioanalytical and Nuclear Chemistry
Additional Journal Information:
Journal Volume: 318; Journal Issue: 1; Journal ID: ISSN 0236-5731
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

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, and Williams, Ross W. New determination of the 229Th half-life. United States: N. p., 2018. Web. doi:10.1007/s10967-018-6032-9.
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. New determination of the 229Th half-life. United States. doi:10.1007/s10967-018-6032-9.
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, and Williams, Ross W. Tue . "New determination of the 229Th half-life". United States. doi:10.1007/s10967-018-6032-9. https://www.osti.gov/servlets/purl/1497940.
@article{osti_1497940,
title = {New determination of the 229Th half-life},
author = {Essex, Richard M. and Mann, Jacqueline L. and Collé, Ronald and Laureano-Perez, Lizbeth and Bennett, Megan E. and Dion, Heather and Fitzgerald, Ryan and Gaffney, Amy M. and Gourgiotis, Alkiviadis and Hubert, Amélie and Inn, Kenneth G. W. and Kinman, William S. and Lamont, Stephen P. and Steiner, Robert and Williams, Ross W.},
abstractNote = {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).},
doi = {10.1007/s10967-018-6032-9},
journal = {Journal of Radioanalytical and Nuclear Chemistry},
number = 1,
volume = 318,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig 1 Fig 1: Simplified decay scheme for 229Th. The uncertainties for the half-lives are standard uncertainties. Half-life and decay mode data for 229Th are from [12]. Half-life and decay mode 60 data for all other isotopes are from [13].

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Works referenced in this record:

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