The Experts below are selected from a list of 23166 Experts worldwide ranked by ideXlab platform
C. Rivier - One of the best experts on this subject based on the ideXlab platform.
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Development and comparison of high accuracy Thermal Ionization methods for uranium isotope ratios determination in nuclear fuel
International Journal of Mass Spectrometry, 2019Co-Authors: A. Quemet, A. Ruas, V. Dalier, C. RivierAbstract:This study presents the development and the comparison of high accuracy methods for the uranium isotope determination by Thermal Ionization mass spectrometry. Two methods for uranium minor isotope ratio determination were compared in term of accuracy, analysable quantity, analysis time and versatility the total evaporation and the classical method with multi-dynamic sequences. The mathematical correction of the abundance sensitivity and the detector calibration within the classical method helps decreasing the uncertainties and the biases compared to the total evaporation method. This comparative study was conducted within the framework of the 2017 Nuclear Material Round Robin participation organized by the International Atomic Energy Agency.
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Americium isotope analysis by Thermal Ionization Mass Spectrometry using the Total Evaporation Method
International Journal of Mass Spectrometry, 2018Co-Authors: A. Quemet, A. Ruas, V. Dalier, C. RivierAbstract:A simple analytical procedure was developed to measure with high accuracy americium isotope ratios and concentration. The method was tested through 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 is a reference technique for actinides isotope determination. Expanded uncertainties were estimated at 0.1 percent and 0.8 percent for the 241Am-243Am isotope ratio and the Am concentration, respectively. Compared to the assigned value, a bias below 0.0001 percent was achieved for the 241Am-243Am isotope ratio and below 0.02 percent was found for the americium concentration.
Bernard Bourdon - One of the best experts on this subject based on the ideXlab platform.
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Design of a prototype Thermal Ionization cavity source intended for isotope ratio analysis
International Journal of Mass Spectrometry, 2018Co-Authors: Colin Maden, Anne Trinquier, Anne-laure Fauré, Amélie Hubert, Fabien Pointurier, Jörg Rickli, Bernard BourdonAbstract:Abstract The design of a prototype Thermal Ionization cavity (TIC) source attached to the mass analyser of a MAT262 Thermal Ionization mass spectrometer is presented. In addition to a detailed calculation and experimental verification of the ion optics, the new design includes several innovative features that set it apart from previously reported TIC sources. The goal is to employ this new ion source for high-efficiency isotope ratio analysis. For uranium adsorbed to a single resin bead, an overall efficiency gain of about a factor of 10 compared to the same sample type analysed by state-of-the-art conventional Thermal Ionization mass spectrometry (TIMS) on a Triton instrument is reported (ions detected per atom loaded). First attempts at isotope ratio analysis of micrometre sized uranium oxide particles, as is commonly done for nuclear safeguards, seem to confirm the enhancement in overall efficiency and could help with the analysis of the minor uranium isotopes on such samples.
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Design of a prototype Thermal Ionization cavity source intended for isotope ratio analysis
International Journal of Mass Spectrometry, 2018Co-Authors: Colin Maden, Anne Trinquier, Anne-laure Fauré, Amélie Hubert, Fabien Pointurier, Jörg Rickli, Bernard BourdonAbstract:The design of a prototype Thermal Ionization cavity (TIC) source attached to the mass analyser of a MAT262 Thermal Ionization mass spectrometer is presented. In addition to a detailed calculation and experimental verification of the ion optics, the new design includes several innovative features that set it apart from previously reported TIC sources. The goal is to employ this new ion source for high-efficiency isotope ratio analysis. For uranium adsorbed to a single resin bead, an overall efficiency gain of about a factor of 10 compared to the same sample type analysed by state-of-the-art conventional Thermal Ionization mass spectrometry (TIMS) on a Triton instrument is reported (ions detected per atom loaded). First attempts at isotope ratio analysis of micrometre sized uranium oxide particles, as is commonly done for nuclear safeguards, seem to confirm the enhancement in overall efficiency and could help with the analysis of the minor uranium isotopes on such samples. (C) 2018 Elsevier B.V. All rights reserved.
A. Quemet - One of the best experts on this subject based on the ideXlab platform.
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Development and comparison of high accuracy Thermal Ionization methods for uranium isotope ratios determination in nuclear fuel
International Journal of Mass Spectrometry, 2019Co-Authors: A. Quemet, A. Ruas, V. Dalier, C. RivierAbstract:This study presents the development and the comparison of high accuracy methods for the uranium isotope determination by Thermal Ionization mass spectrometry. Two methods for uranium minor isotope ratio determination were compared in term of accuracy, analysable quantity, analysis time and versatility the total evaporation and the classical method with multi-dynamic sequences. The mathematical correction of the abundance sensitivity and the detector calibration within the classical method helps decreasing the uncertainties and the biases compared to the total evaporation method. This comparative study was conducted within the framework of the 2017 Nuclear Material Round Robin participation organized by the International Atomic Energy Agency.
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Americium isotope analysis by Thermal Ionization Mass Spectrometry using the Total Evaporation Method
International Journal of Mass Spectrometry, 2018Co-Authors: A. Quemet, A. Ruas, V. Dalier, C. RivierAbstract:A simple analytical procedure was developed to measure with high accuracy americium isotope ratios and concentration. The method was tested through 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 is a reference technique for actinides isotope determination. Expanded uncertainties were estimated at 0.1 percent and 0.8 percent for the 241Am-243Am isotope ratio and the Am concentration, respectively. Compared to the assigned value, a bias below 0.0001 percent was achieved for the 241Am-243Am isotope ratio and below 0.02 percent was found for the americium concentration.
Colin Maden - One of the best experts on this subject based on the ideXlab platform.
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Design of a prototype Thermal Ionization cavity source intended for isotope ratio analysis
International Journal of Mass Spectrometry, 2018Co-Authors: Colin Maden, Anne Trinquier, Anne-laure Fauré, Amélie Hubert, Fabien Pointurier, Jörg Rickli, Bernard BourdonAbstract:Abstract The design of a prototype Thermal Ionization cavity (TIC) source attached to the mass analyser of a MAT262 Thermal Ionization mass spectrometer is presented. In addition to a detailed calculation and experimental verification of the ion optics, the new design includes several innovative features that set it apart from previously reported TIC sources. The goal is to employ this new ion source for high-efficiency isotope ratio analysis. For uranium adsorbed to a single resin bead, an overall efficiency gain of about a factor of 10 compared to the same sample type analysed by state-of-the-art conventional Thermal Ionization mass spectrometry (TIMS) on a Triton instrument is reported (ions detected per atom loaded). First attempts at isotope ratio analysis of micrometre sized uranium oxide particles, as is commonly done for nuclear safeguards, seem to confirm the enhancement in overall efficiency and could help with the analysis of the minor uranium isotopes on such samples.
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Design of a prototype Thermal Ionization cavity source intended for isotope ratio analysis
International Journal of Mass Spectrometry, 2018Co-Authors: Colin Maden, Anne Trinquier, Anne-laure Fauré, Amélie Hubert, Fabien Pointurier, Jörg Rickli, Bernard BourdonAbstract:The design of a prototype Thermal Ionization cavity (TIC) source attached to the mass analyser of a MAT262 Thermal Ionization mass spectrometer is presented. In addition to a detailed calculation and experimental verification of the ion optics, the new design includes several innovative features that set it apart from previously reported TIC sources. The goal is to employ this new ion source for high-efficiency isotope ratio analysis. For uranium adsorbed to a single resin bead, an overall efficiency gain of about a factor of 10 compared to the same sample type analysed by state-of-the-art conventional Thermal Ionization mass spectrometry (TIMS) on a Triton instrument is reported (ions detected per atom loaded). First attempts at isotope ratio analysis of micrometre sized uranium oxide particles, as is commonly done for nuclear safeguards, seem to confirm the enhancement in overall efficiency and could help with the analysis of the minor uranium isotopes on such samples. (C) 2018 Elsevier B.V. All rights reserved.
Yixiang Duan - One of the best experts on this subject based on the ideXlab platform.
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Characterization of an improved Thermal Ionization cavity source for mass spectrometry
Journal of the American Society for Mass Spectrometry, 1999Co-Authors: Yixiang Duan, Robert E. Steiner, David M. Wayne, Vahid Majidi, Ray E. Danen, Xiaomei Yan, Juan A. Cuadrado, Joséa. OlivaresAbstract:A new Thermal Ionization source for use with a quadrupole mass spectrometer has been designed and characterized. The new source provides significant advantages over the previously reported prototype source and traditional filament-type Thermal Ionization sources. The operational interface between the source and the quadrupole mass spectrometer has been redesigned. A vacuum interlock, a translational stage, and an adjustable insertion probe are added to improve the source performance. With these modifications, the source is easier to operate while maximizing sample throughput. In this work, the performance of the newly developed source is examined. The Ionization efficiencies are measured with a quadrupole mass spectrometer. The efficiency values obtained with this system are comparable to those obtained from a large scale isotope separator. The relationships among the Ionization potential, vapor pressure, and measured Ionization efficiency results are discussed. The crucible lifetime has been quantitatively estimated by measuring the crucible sputtering rate. Diagnostic studies of the new source show that the crucible position is a crucial parameter for sensitivity and performance. Stability tests demonstrate that the source can be run several weeks at a fixed emission current without significant degradation.
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Development of a new high-efficiency Thermal Ionization source for mass spectrometry
International Journal of Mass Spectrometry and Ion Processes, 1997Co-Authors: Yixiang Duan, E.p. Chamberlin, Joséa. OlivaresAbstract:Abstract A Thermal Ionization source for mass spectrometry has been designed and tested. The ion source is based on a tungsten crucible with a deep cavity into which the sample is loaded. The crucible is heated by high energy electron bombardment from a tantalum filament surrounding the crucible. As the sample evaporates inside the crucible, gaseous analyte atoms are produced which interact with the inner surface of the crucible walls to produce positive ions through surface Ionization. The ions are extracted from the cavity through a small opening at the end of the crucible. Regulation of the electron emission current makes it possible to control the energy and power applied to the crucible and, therefore, the crucible temperature. A number of elements have been tested in this source. The Ionization efficiencies measured using a high transmission isotope separator spectrometer show 10 to 100 times higher efficiency than in conventional surface Thermal Ionization sources.
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Recent improvements of a new Thermal Ionization cavity source for mass spectrometry
1996Co-Authors: Yixiang Duan, J.a. Olivares, Ray E. Danen, T.j. ClelandAbstract:Last year, we presented a prototype ion source design for mass spectrometry, which uses a tungsten crucible with a deep cavity for sample loading and enhanced surface Ionization; the crucible is heated by high energy electron bombardment. This ion source was named as a Thermal Ionization cavity (TIC). In this present work, an TIC source has been designed with a vacuum interlock system and translational stage. It is now easier to operate and handle while maximizing sample throughput.
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Thermal Ionization cavity source for mass spectrometry
1995Co-Authors: J.a. Olivares, E.p. Chamberlin, Yixiang DuanAbstract:Thermal Ionization mass spectrometry (TIMS) is widely used for isotopic determination, and elemental concentration measurements by isotope dilution. TIMS is applicable to over 70 elements in the periodic table, often, with very high sensitivity, low detection limits, high precision, and high accuracy. Probably due to its success and simplicity, the traditional resistively heated filament type ion source, used in TIMS, has remained relatively unchanged in the past 50 years. Only minor changes in the number of filaments used for vaporization and Ionization, and the shape of the filament have been employed. Much of the science of Thermal Ionization has focused on sample preparation, and chemical Ionization enhancers. Beyer et al., in the USSR, and Johnson et al., later in the US, introduced a new high temperature cavity-type Thermal Ionization source for isotope separation on-line (ISOL) projects. Delmore et al. introduced a similar cavity-type source for the study of Thermal emission of primary ions for secondary Ionization mass spectrometry (SIMS). A new Thermal Ionization cavity-type source for mass spectrometry has been developed in this laboratory.
