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Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to uranium certified reference materials

Journal Article · · Journal of Radioanalytical and Nuclear Chemistry
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division. Physical and Life Sciences Directorate
Uranium certified reference materials (CRM) issued by New Brunswick Laboratory were subjected to dating using four independent uranium-series radiochronometers. In all cases, there was acceptable agreement between the model ages calculated using the 231Pa–235U, 230Th–234U, 227Ac–235U or 226Ra–234U radiochronometers and either the certified 230Th–234U model date (CRM 125-A and CRM U630), or the known purification date (CRM U050 and CRM U100). Finally, the agreement between the four independent radiochronometers establishes these uranium certified reference materials as ideal informal standards for validating dating techniques utilized in nuclear forensic investigations in the absence of standards with certified model ages for multiple radiochronometers.
Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
Dept. of Homeland Security (DHS) (United States); USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1424080
Alternate ID(s):
OSTI ID: 22686785
Report Number(s):
LLNL-JRNL--737009
Journal Information:
Journal of Radioanalytical and Nuclear Chemistry, Journal Name: Journal of Radioanalytical and Nuclear Chemistry Journal Issue: 3 Vol. 314; ISSN 0236-5731
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

References (8)

Evaluation of chronometers in plutonium age determination for nuclear forensics: What if the ‘Pu/U clocks’ do not match? journal July 2014
Round-robin 230Th–234U age dating of bulk uranium for nuclear forensics journal July 2015
Developing 226Ra and 227Ac age-dating techniques for nuclear forensics to gain insight from concordant and non-concordant radiochronometers journal September 2015
The half-lives of uranium-234 and thorium-230 journal August 2000
Age Determination of Highly Enriched Uranium:  Separation and Analysis of 231 Pa journal November 2002
235U–231Pa age dating of uranium materials for nuclear forensic investigations journal January 2013
Precision Measurement of Half-Lives and Specific Activities of U 235 and U 238 journal November 1971
Nuclear Forensic Analysis book February 2005

Cited By (6)

Application of the 226Ra–230Th–234U and 227Ac–231Pa–235U radiochronometers to UF6 cylinders journal June 2018
Production and standardization of an on-demand protactinium-233 tracer journal August 2018
A case study in plutonium radiochronometry using multiple isotope systems journal August 2018
Improved protactinium spike calibration method applied to 231Pa–235U age-dating of certified reference materials for nuclear forensics journal August 2018
Evaluating uranium radiochronometry by single-collector mass spectrometry for nuclear forensics: a multi-instrument investigation journal October 2019
An interlaboratory collaboration to determine consensus 231Pa/235U model ages of a uranium certified reference material for nuclear forensics journal February 2020