Determination of Uranium Content and Isotopic Composition by Isotope Dilution Mass Spectrometry
Analytical Services; mass spectrometry; uranium, isotope, oxide
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Specific Material\Uranium; Specific Material\Uranium
1996 Aug 05
Y/P65-8053, Rev. B
Originating Research Org.:
Lockheed Martin Energy Systems, Inc.
OpenNet Entry Date:
1998 Jun 16
This document concerns the method for the determination of the uranium concentration in uranium oxides by isotope dilution mass spectrometry (IDMS). The apparatus, reagents and materials, hazards, sampling, subsamples and test samples, calibration and standardization, and procedure are explained. There is also an explanation of the calculation/interpretation of results, report, precision and bias on normal uranium standards, and quality assurance/quality control. To measure the elemental uranium concentration of uranium oxides by IDMS, a representative and accurately measured aliquot of sample is prepared. A known quantity of U-233 (spike) is added to an aliquot of sample. The sample aliquot and spike are taken to dryness, redissolved in dilute nitric acid, and loaded on a filament for analysis in a thermal ionization mass spectrometer (TIMS). After measuring the isotopic ratios in the spiked sample, the uranium content and isotopic composition of the sample are calculated.