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New determination of the 229Th half-life

Journal Article · · Journal of Radioanalytical and Nuclear Chemistry
 [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)
+ Show Author Affiliations

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).

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 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

References (12)

A new primary standardization of 229Th journal July 2010
The uncertainty of the half-life journal May 2015
Uranium age determination by measuring the 230Th/234U ratio journal May 2005
The standardisation of for an environmental yield tracer journal July 2000
A new thorium-229 reference material journal April 2018
Production of Ac-225 from Th-229 for Targeted α Therapy journal October 2005
The uncertainty of the half-life journal May 2015
The 4n + 1 Radioactive Series: The Decay Products of U 233 journal August 1950
Half-life of Th 229 journal December 1989
A review on the mass spectrometric analysis of thorium journal January 2016
230 Th- 234 U model ages of some uranium standard reference materials journal September 2011
Guidelines for evaluating and expressing the uncertainty of NIST measurement results report January 1994

Figures / Tables (10)

Fig 1(p. 6)figure Fig 1
Table 1(p. 11)table Table 1
Table 2(p. 13)table Table 2
Table 3(p. 15)table Table 3
Table 4(p. 16)table Table 4
Table 5(p. 18)table Table 5
Table 6(p. 19)table Table 6
Fig. 2(p. 20)figure Fig. 2
Table 7(p. 22)table Table 7
Fig. 2(p. 24)figure Fig. 2

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY