A new highly enriched 233U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples

Essex, Richard M.; Williams, Ross W.; Rogers, Kayron T.; Hexel, Cole R.; Parsons-Davis, Tashi; Treinen, Kerri C.

doi:10.1016/j.talanta.2020.121638

Title: A new highly enriched ²³³U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples

Journal Article · 07 September 2021 · Talanta

DOI: https://doi.org/10.1016/j.talanta.2020.121638 · OSTI ID:1678855

Essex, Richard M. ^[1]; Williams, Ross W. ^[2];

^[3];

^[3]; Parsons-Davis, Tashi ^[2];

^[2]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A highly-enriched ²³³U reference material (>0.99987 n(²³³U)/n(U)) has been prepared and characterized for use as an isotope dilution mass spectrometry spike. An ion exchange separation was performed on 1 g of high purity ²³³U to further reduce trace amounts of contaminant Pu in the material. The purified ²³³U was then prepared as a master solution which was analyzed for molality of uranium by modified Davies and Gray titration. A portion of the master solution was quantitatively diluted and dispensed for reference material units. Selected units were analyzed for verification of uranium amount and to characterize uranium isotope amount ratios by multi-collector inductively couple plasma mass spectrometry. Furthermore, modelling of spike-corrected isotopic data show that the new spike will enable simultaneous measurements of uranium amount and isotope amount ratios with resulting uncertainties that are substantially less sensitive to over spiking than widely used ²³³U certified reference materials.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725; AC52-07NA27344

OSTI ID:: 1678855

Report Number(s):: LLNL-JRNL--814535; 1022965

Journal Information:: Talanta, Journal Name: Talanta Journal Issue: na Vol. 221; ISSN 0039-9140

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

233U
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
Uranium
isotope amount ratio
isotope dilution mass spectrometry
modified Davies and Gray titration
nuclear forensics
nuclear safeguards

Title: A new highly enriched 233U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples

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References (15)

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Title: A new highly enriched ²³³U reference material for improved simultaneous determination of uranium amount and isotope amount ratios in trace level samples