Alexandre Quémet

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Development and comparison of two high accuracy methods for uranium concentration in nuclear fuel: ID-TIMS and K-edge densitometry

Alexandre Quemet, Alexandre Ruas, Eric Esbelin, Vincent Dalier, more

Journal of Radioanalytical and Nuclear Chemistry > 2019 > 321 > 3 > 997-1004

This study compares the two analytical methods for uranium concentration determination with high accuracy in uranium pellet: K-edge densitometer (KED) and the isotope dilution with thermal ionisation mass spectrometry measurements (ID-TIMS). Both techniques are compared in terms of time, generated radioactive effluent, simplicity, uncertainty estimation and detection limit. ID-TIMS shows lower detection...

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Americium isotope analysis by Thermal Ionization Mass Spectrometry using the total evaporation method

Alexandre Quemet, Alexandre Ruas, Vincent Dalier, Cédric Rivier

International Journal of Mass Spectrometry > 2018 > 431 > C > 8-14

In this paper, a simple analytical procedure was developed to measure americium isotope ratios and concentration with high accuracy. The method was tested during the participation in a round robin test organized by the Analytical Methods Committee of the French Atomic Energy Commission. The measurements were performed by Thermal Ionization Mass Spectrometry using the total evaporation method, which...

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Zr precipitation kinetics in irradiated fuel dissolution solution by TIMS and ICP-MS: a combined study

Sarah Baghdadi, Alexandre Quémet, Eric Esbelin, Yohann Manidren, more

Journal of Radioanalytical and Nuclear Chemistry > 2017 > 314 > 3 > 2377-2382

This study presents the combined analysis of leftover zirconium in irradiated fuel dissolution solution through time. Thermo-ionisation mass spectrometry was used to analyse the kinetics start and final aliquots with uncertainties lower than 3%, while inductively coupled plasma-mass spectrometry (ICP-MS) was used for intermediary aliquots. In order to obtain low uncertainties using ICP-MS, dissolution...

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Contribution of the Faraday cup coupled to 1012Ω current amplifier to uranium 235/238 and 234/238 isotope ratio measurements by thermal ionization mass spectrometry

Alexandre Quemet, Melody Maloubier, Alexandre Ruas

International Journal of Mass Spectrometry > 2016 > 404 > C > 35-39

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 10¹²Ω current amplifying system. This system improves the electronic sensitivity compared to the same Faraday cups coupled to 10¹¹Ω current amplifiers. The analytical procedure developed...

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Determination of zirconium isotope composition and concentration for nuclear sample analysis using Thermal Ionization Mass Spectrometry

Alexandre Quemet, Christophe Maillard, Alexandre Ruas

International Journal of Mass Spectrometry > 2015 > 392 > C > 34-40

A new Thermal Ionization Mass Spectrometry (TIMS) analytical procedure was developed to measure with high accuracy the zirconium isotope abundance and concentration without molybdenum correction in nuclear samples. A zirconium selective separation using UTEVA column was used before the TIMS measurement in order to remove all possible isobaric interferences (Mo, Y, Nb and Ru) in the solution. The separated...

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Development of an analysis method of minor uranium isotope ratio measurements using electron multipliers in Thermal Ionization Mass Spectrometry

Alexandre Quemet, Melody Maloubier, Vincent Dalier, Alexandre Ruas

International Journal of Mass Spectrometry > 2014 > 374 > Complete > 26-32

A simple analytical procedure was developed to measure with high accuracy the isotope ratio of minor isotope of natural uranium present in small quantities using a thermal ionization mass spectrometer (TIMS). The reduction of quantities used for analysis and the measurement of non-abundant isotopes are of prime interest in the nuclear industry. Indeed it is necessary to reduce the analyst received...

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Reactivity of lanthanoid mono-cations with ammonia: A combined inductively coupled plasma mass spectrometry and computational investigation

Alexandre Quemet, Pierre Vitorge, Alvaro Cimas, Shengsi Liu, more

International Journal of Mass Spectrometry > 2013 > 334 > Complete > 27-37

The behavior of La ⁺ , Sm ⁺ , Eu ⁺ and Gd ⁺ with NH ₃ (g) and ND ₃ (g) was studied to understand gas phase chemical reactions used for separations in the reaction cell of a quadrupole inductively coupled plasma-mass spectrometer (ICP-MS). For Ln ⁺ =La ⁺ and Gd ⁺ , the primary reaction channel is the formation of the LnNH ⁺...

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Analysis of twenty five impurities in uranium matrix by ICP-MS with iron measurement optimized by using reaction collision cell, cold plasma or medium resolution

Alexandre Quemet, Rene Brennetot, Emilie Chevalier, Edwina Prian, more

Talanta > 2012 > 99 > Complete > 207-212

An analytical procedure was developed to determine the concentration of 25 impurities (Li, Be, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Mo, Ag, Cd, In, Sm, Eu, Gd, Dy, W, Pb, Bi and Th) in a uranium matrix using the quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS). The dissolution of U ₃ O ₈ powder was made with a mixture of hydrochloric acid and nitric acid. Then,...

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How Can f‐Block Monocations Behave as Monocations of d‐Block Transition Metals?

Alexandre Quemet, Rene Brennetot, Jean‐Yves Salpin, Alvaro Cimas, more

European Journal of Inorganic Chemistry > 2012 > 22 > 3551 - 3555

The electronic structures of LnNH⁺ species are studied by DFT (B3LYP) quantum calculations for the Ln = La, Eu and Gd 4f‐block elements (lanthanides). Ln≡N triple bonds of essentially d character are formed for La and Gd, which explains why La⁺ and Gd⁺ behave like ions of d‐block transition metals, as experimentally evidenced by mass spectrometry, and why the Ln⁺ reactivity is correlated with its...

INFONA - science communication portal

Search results for: Alexandre Quémet

Development and comparison of two high accuracy methods for uranium concentration in nuclear fuel: ID-TIMS and K-edge densitometry

Americium isotope analysis by Thermal Ionization Mass Spectrometry using the total evaporation method

Zr precipitation kinetics in irradiated fuel dissolution solution by TIMS and ICP-MS: a combined study

Contribution of the Faraday cup coupled to 1012Ω current amplifier to uranium 235/238 and 234/238 isotope ratio measurements by thermal ionization mass spectrometry

Determination of zirconium isotope composition and concentration for nuclear sample analysis using Thermal Ionization Mass Spectrometry

Development of an analysis method of minor uranium isotope ratio measurements using electron multipliers in Thermal Ionization Mass Spectrometry

Reactivity of lanthanoid mono-cations with ammonia: A combined inductively coupled plasma mass spectrometry and computational investigation

Analysis of twenty five impurities in uranium matrix by ICP-MS with iron measurement optimized by using reaction collision cell, cold plasma or medium resolution

How Can f‐Block Monocations Behave as Monocations of d‐Block Transition Metals?

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