Title: Isotope Ratio Measurements of pg-size Plutonium Samples using TIMS in Combination with "Multiple Ion Counting" and Filament Carburization
Authors: JAKOPIC RozleRICHTER StephanKUEHN HeinzBENEDIK LjudmilaPIHLAR B.AREGBE Yetunde
Citation: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY vol. 279 no. 1 p. 87-92
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2009
JRC N°: JRC47450
ISSN: 1387-3806
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC47450
DOI: 10.1016/j.ijms.2008.10.014
Type: Articles in Journals
Abstract: A new sample preparation procedure for isotopic measurements using Thermal Ionization MAss Spectrometry (TIMS) was developed which employs the technique of carburization of rhenium filaments. Carburized filaments were prepared in a special vacuum chamber in which the filaments were exposed to benzene vapour as a carbon supply and carburized electrothermally. To find the optimal conditions for the carburization and isotopic measurements using TIMS, the influence of various parameters such as benzene pressure, carburization current and the exposure time were tested. As a result, carburization of the filaments improved the ionization efficiency by one order of magnitude. Additionally, a new "multi-dynamic" measurement technique was developed for Pu isotope ratio measurements using a "multiple ion counting" (MIC) system. This technique was combined with filament carburization and applied to the NBL-137 isotopic standard and samples of the NUSIMEP 5 inter-laboratory comparison campaign, which included certified plutonium materials at the ppt-level. The multi-dynamic measurement technique for plutonium, in combination with filament carburization, has been shown to significantly improve the precision and accuracy for isotopic analysis of environmental samples with low-levels of plutonium.
JRC Institute:Institute for Reference Materials and Measurements

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