Title: Advances in Low Level Uranium and Plutonium Isotope Mass Spectrometry Using Multiple Ion Counting and Filament Carburization
Citation: Proceedings of the INMM 49th Annual Meeting p. 1-7
Publisher: INMM
Publication Year: 2008
JRC N°: JRC45910
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC45910
Type: Articles in periodicals and books
Abstract: After upgrading IRMM's mass spectrometric capabilities for certification measurements for uranium and plutonium using large sample sizes during the previous years, in 2006 - 2007 we focused on necessary improvements in the area of low-level isotopic analyses for uranium and plutonium. Improving low-level isotope mass spectrometry for uranium and plutonium at IRMM consisted of three steps. First a new thermal ionization mass spectrometer was acquired in order to have an instrument which can be upgraded with a "Multiple Ion Counting" (MIC) system. The second step of improvement was to implement the principle of "multi-dynamic" measurements for both uranium and plutonium measurements. This "multi-dynamic" measurement procedure provides an internal calibration of the MIC system and therefore circumvents the need for complicated inter-calibration routines. As a third step, a filament carburization procedure was implemented by which the ionization efficiencies for uranium and plutonium were improved by a factor of 3 and 10, respectively. Results for measurements performed on samples of previous NUSIMEP campaigns will be shown in comparison to results from various techniques employed by participating laboratories.
JRC Directorate:Health, Consumers and Reference Materials

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