Title: Update on REIMEP-15: Isotopic Ratios of uranium in UF6
Publication Year: 2005
JRC N°: JRC30068
Other Identifiers: EUR 21562 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30068
Type: EUR - Scientific and Technical Research Reports
Abstract: The REIMEP (Regular European Interlaboratory Measurement Evaluation Programme) campaign 15 for isotopic ratios of uranium in UF6 samples has been completed in 2002. The participants received 4 samples of low-enriched or slightly depleted uranium in the form of UF6 in standard monel capsules. The samples were prepared at IRMM by mixing uranium reference materials certified by gas mass-spectrometry in the form of UF6. The minor isotopes, 234U and 236U were certified at IRMM by Thermal Isotope Mass-spectrometry (TIMS) using a MAT262-RPQ mass spectrometer in ion counting mode. Certified values were sent to the participating laboratories immediately after receiving their measured results. The measured results and their comparison with the certified values allowed an overall view of the analytical capability in the nuclear field to measure uranium isotopic ratios in UF6 samples. However, for the so-called minor ratio 234U.238U the comparison of IRMM¿s certified values with all the participants results showed a significant relative deviation of about 2%, which is by far larger than the typical uncertainties expected for this kind of measurements. This significant deviation was considered disappointing for IRMM as the leading European nuclear safeguards metrology institute. This problem has now overcome first by measurements using the new TRITON TIMS at IRMM and second by a thorough investigation on the reasons for the deviation observed in the past.
JRC Directorate:Health, Consumers and Reference Materials

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