Journal
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
Volume 404, Issue -, Pages 35-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijms.2016.04.005
Keywords
TIMS; Uranium; Isotope ratio; 10(12) Omega current amplifier; SEM; Faraday cup
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This work highlights the possibility of improving, for given deposited quantities, the accuracy of uranium isotope ratio determination by Thermal Ionization Mass Spectrometry (TIMS) using Faraday cups coupled to a 10(12) Omega current amplifying system. This system improves the electronic sensitivity compared to the same Faraday cups coupled to 10(12) Omega current amplifiers. The analytical procedure developed in a previous work (Quemet et al., 2014) was applied in order to study the improvements in accuracy using the Faraday cups equipped with 10(12) Omega current amplifier. The U-234/U-238 and U-235/U-238 isotope ratios were measured on the Certified Reference Material IRMM 052 (natural uranium). Results were evaluated relying on NF T 90-210 norm regarding method validation. The U-234/U-238 and U-235/U-238 isotope ratios were studied by total evaporation using different configurations. First, U-234 or U-235 was measured with a Faraday cup coupled to a 10(12) Omega current amplifier and U-238 was measured with a Faraday cup coupled to a 10(12) Omega current amplifier. Then, 234U or U-235 was measured by discrete dynodes electron multiplier and U-238 was measured with a Faraday cup coupled to a 10(12) Omega current amplifier. In comparison to the configurations using the 10(12) Omega current amplifier, the analyzable quantity was reduced from 250 ng to 100 ng for the U-235/U-238 isotope ratio and from 50 ng to 3 ng for the U-234/U-238 isotope ratio with extended uncertainty below 0.28% for the U-235/U-238 isotope ratio, in compliance with the International Target Values (ITV 2010), and below 5% for the U-234/U-238 isotope ratio. (C) 2016 Elsevier B.V. All rights reserved.
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