Contribution of the Faraday cup coupled to 10 12 ohms current amplifier for uranium 235/238 and 234/238 isotope ratio measurements by Thermal Ionization Mass Spectrometry - Archive ouverte HAL Access content directly
Journal Articles International Journal of Mass Spectrometry Year : 2016

Contribution of the Faraday cup coupled to 10 12 ohms current amplifier for uranium 235/238 and 234/238 isotope ratio measurements by Thermal Ionization Mass Spectrometry

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Abstract

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 current amplifying system. This system improves the electronic sensitivity compared to the same Faraday cups coupled to 10 11 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 current amplifier. The 234 U/ 238 U and 235 U/ 238 U 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 234 U/ 238 U and 235 U/ 238 U isotope ratios were studied by total evaporation using different configurations. First, 234 U or 235 U was measured with a Faraday cup coupled to a 10 12 current amplifier and 238 U was measured with a Faraday cup coupled to a 10 11 current amplifier. Then, 234 U or 235 U was measured by discrete dynodes electron multiplier and 238 U was measured with a Faraday cup coupled to a 10 12 current amplifier. In comparison to the configurations using the 10 11 current amplifier, the analyzable quantity was reduced from 250 ng to 100 ng for the 235 U/ 238 U isotope ratio and from 50 ng to 3 ng for the 234 U/ 238 U isotope ratio with extended uncertainty below 0.28% for the 235 U/ 238 U isotope ratio, in compliance with the International Target Values (ITV 2010), and below 5% for the 234 U/ 238 U isotope ratio.
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Dates and versions

cea-03470752 , version 1 (08-12-2021)

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Alexandre Quemet, Melody Maloubier, Vincent Dalier, Alexandre Ruas. Contribution of the Faraday cup coupled to 10 12 ohms current amplifier for uranium 235/238 and 234/238 isotope ratio measurements by Thermal Ionization Mass Spectrometry. International Journal of Mass Spectrometry, 2016, 404, pp.35 - 39. ⟨10.1016/j.ijms.2016.04.005⟩. ⟨cea-03470752⟩

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