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

TALANTA

卷:221

Article

Essex, Richard M.¹  Williams, Ross W.²  Rogers, Kayron T.³  Hexel, Cole R.³  Parsons-Davis, Tashi²  Treinen, Kerri C.² 

[1] NIST, 100 Bur Dr,Mail Stop 8462, Gaithersburg, MD 20899 USA

[2] Lawrence Livermore Natl Lab, POB 808,L-231, Livermore, CA 94551 USA

[3] Oak Ridge Natl Lab, Chem Sci Div, 1 Bethel Valley Rd, Oak Ridge, TN 37830 USA

关键词: Uranium;    U-233;    Isotope amount ratio;    Isotope dilution mass spectrometry;    Modified Davies and Gray titration;    Nuclear forensics;    Nuclear safeguards;   

DOI  :  10.1016/j.talanta.2020.121638

来源: Elsevier

【 摘 要 】

A highly-enriched U-233 reference material (>0.99987 n(U-233)/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 U-233 to further reduce trace amounts of contaminant Pu in the material. The purified U-233 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. 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 U-233 certified reference materials.

【 授权许可】

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