Add time:07/27/2019         Source:sciencedirect.com

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 1012 Ω current amplifying system. This system improves the electronic sensitivity compared to the same Faraday cups coupled to 1011 Ω 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 1012 Ω current amplifier. The 234U/238U and 235U/238U 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 234U/238U and 235U/238U isotope ratios were studied by total evaporation using different configurations. First, 234U or 235U was measured with a Faraday cup coupled to a 1012 Ω current amplifier and 238U was measured with a Faraday cup coupled to a 1011 Ω current amplifier. Then, 234U or 235U was measured by discrete dynodes electron multiplier and 238U was measured with a Faraday cup coupled to a 1012 Ω current amplifier. In comparison to the configurations using the 1011 Ω current amplifier, the analyzable quantity was reduced from 250 ng to 100 ng for the 235U/238U isotope ratio and from 50 ng to 3 ng for the 234U/238U isotope ratio with extended uncertainty below 0.28% for the 235U/238U isotope ratio, in compliance with the International Target Values (ITV 2010), and below 5% for the 234U/238U isotope ratio.

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