Title: The Isotopic Composition of Natural Uranium Samples - Measurements Using the New n(233U)/n(236U) Double Spike IRMM-3636
Authors: RICHTER STEPHANALONSO MUNOZ ADOLFOEYKENS ROGERJAKOBSSON ULFKUEHN HEINZVERBRUGGEN ANDREAREGBE YETUNDEKEEGAN ElizabethWELLUM Roger
Citation: INTERNATIONAL JOURNAL OF MASS SPECTROMETRY vol. 269 no. 1-2 p. 145-148
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2008
JRC N°: JRC40572
ISSN: 1387-3806
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC40572
DOI: 10.1016/j.ijms.2007.09.012
Type: Articles in Journals
Abstract: The new double spike isotope reference material IRMM-3636 was prepared gravimetrically using highly enriched 233U and 236U isotopic material. The n(233U)/n(236U) ratio was certified with an extended relative uncertainty of 0.016%. By mixing the n(233U)/n(236U) double spike with a sample and applying internal mass fractionation correction, the n(235U)/n(238U) ratio of the sample can be determined with the highest possible precision and accuracy. The IRMM-3636 double spike was applied for measurements of natural uranium ore samples. The results for n(235U)/n(238U) ratios were compared to earlier data obtained using UF6 gas sources mass spectrometry and to the recommended IUPAC value. The results clearly show that the historically used consensus value of 1/137.88 cannot be considered representative for natural uranium samples in general.
JRC Institute:Institute for Reference Materials and Measurements

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