Title: Preparation and Certification of uranium QUAD isotopic reference materials IRMM-3100 and IRMM-3102
Publisher: European Commission
Publication Year: 2008
JRC N°: JRC48379
ISBN: 978-92-79-10326-1
ISSN: 1018-5593
Other Identifiers: EUR 23543 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC48379
DOI: 10.2787/89046
Type: EUR - Scientific and Technical Research Reports
Abstract: Isotopic reference material IRMM-3101 was prepared by mixing of solutions from highly enriched 99.96% 233U (IRMM-3630), 99.994% 235U (IRMM-3650), 99.97% 236U (IRMM-3660) and 99.99998% 238U (IRMM-3680) in order to obtain an isotopic ratio n(233U)/n(235U)/n(236U)/n(238U) close to unity. IRMM-3100 and IRMM-3102 were prepared from IRMM-3101 by gravimetrical dilution. The certified isotope amount ratio for ratio n(233U)/n(236U) has been established by mass metrology and was verified by isotope mass spectrometry. The methodology used in the preparation and certification was similar to that of comparable uranium mixtures made in the past. The certified ratios n(234U)/n(236U), n(235U)/n(236U) and n(238U)/n(236U) have been measured by TIMS in multi-dynamic mode and using the n(233U)/n(236U) ratio for internal normalization. The Isotopic Reference Materials IRMM-3100, IRMM-3101 and IRMM-3102 are part of a systematic IRMM programme to supply Isotopic Reference Materials of various isotopes at different concentrations. The Isotopic Reference Material is supplied in a polyethylene ampoule containing 1 mL of a 1 M nitric acid solution.
JRC Directorate:Health, Consumers and Reference Materials

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