Abstract
In 2014 the United States Department of Energy and the China Institute of Atomic Energy collaborated in a study measuring the model ages of uranium certified reference materials. Lawrence Livermore National Laboratory (LLNL) and Los Alamos National Laboratory (LANL), and the Chinese Institute of Atomic Energy (CIAE) determined 230Th–234U model ages for uranium certified reference materials U010 and U850. The aim of this work was to collaborate with CIAE and compare methods for measuring the age of bulk uranium materials using the 230Th–234U radiochronometer. Accurate results for age-dating depend on the accurate calibration of the tracer materials (e.g., 229Th and 233U) used for the isotope dilution mass spectrometry (IDMS) analyses. To facilitate inter-comparison of results, samples of a 230Th standard reference material were distributed to each laboratory for 229Th tracer inter-calibration. The resulting 230Th–234U model ages from this collaboration for U010 ranged from March 1956 to January 1959, which agree with the known material production date of June 5th, 1958. The determined model ages for U850 were from December 1955 to October 1957, which agree with the material production date of December 31, 1957. All three laboratories used independent methods to determine model ages for uranium standards that agree with known production ages and with previously reported results.
Similar content being viewed by others
References
Ivanovich M, Harmon RS (1982) Uranium-series disequilibrium. Oxford University Press, Oxford
Petit GS (1960) Preparation of uranium isotopic standards for the National Bureau of Standards. Union Carbide Nuclear Company, Oak Ridge, Tennessee. Oak Ridge National Laboratory, Report #KL-8, Department of Energy/K25 Archives
Wallenius M, Morgenstern A, Apostolidis C, Klaus M (2002) Determination of the age of highly enriched uranium. Anal Bioanal Chem 374:379–384
Williams RW, Gaffney AM (2011) 230Th–234U model ages of some uranium standard reference materials. Radiochim Acta 1:31–35
Cheng H, Edwards RL, Shen C, Polyak VJ, Aserom Y, Woodhead J, Hellstron J, Wang Y, Kong X, Spotl C, Wang X, Alexander A Jr (2013) Improvements in 230Th dating, 230Th and 234U half-life values, and U–Th isotopic measurements by multi-collector inductively coupled plasma mass spectrometry. Earth Planet Sci Lett 371–372:82–91
Mayer K, Wallenius M, Varga Z (2013) Nuclear forensic science: correlating measurable material parameters to the history of nuclear material. Chem Rev 113:884–900
Varga Z, Nicholl A, Wallenius M, Mayer K (2012) Development and validation of a methodology for uranium radiochronometry reference material preparation. Anal Chim Acta 718:25–31
Varga Z, Wallenius M, Klaus M (2010) Age determination of uranium samples by inductively coupled plasma mass spectrometry using direct measurement and spectral deconvolution. J Anal Spectrom 25:1958–1962
Chen Yan, Zhao Yong-Gang, Li Li-Li, Chang Zhi-Yuan, Liu-Chao Zhu, Xiao Guo-Ping, Huang Sheng-Hui (2017) A comparison of two calibration methods of the 229Th spike for uranium age dating by 230Th/234U radiochronometer. J Radioanal Nucl Chem. https://doi.org/10.1007/s10967-017-5396-6
Gaffney AM, Hubert Am, Kinman WS, Magara M, Okubo A, Pointurier F, Schorzman KS, Steiner RE, Williams RW (2016) Round-robin 230Th–234U age dating of bulk uranium for nuclear forensics. J Radioanal Nucl Chem 307:2055–2060
Acknowledgements
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Releasable to external audiences, LLNL-JRNL-739136.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Treinen, K.C., Kinman, W.S., Chen, Y. et al. US-DOE and CIAE international cooperation in age-dating uranium standards. J Radioanal Nucl Chem 314, 2469–2474 (2017). https://doi.org/10.1007/s10967-017-5593-3
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10967-017-5593-3