Title: CERTIFICATION REPORT: Preparation and Certification of the Uranium Oxide Microparticles IRMM-2329P
Publisher: Publications Office of the European Union
Publication Year: 2020
JRC N°: JRC117635
ISBN: 978-92-76-09878-2 (online)
ISSN: 1831-9424 (online)
Other Identifiers: EUR 29840 EN
OP KJ-NA-29840-EN-N (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC117635
DOI: 10.2760/584367
Type: EUR - Scientific and Technical Research Reports
Abstract: This report describes the certification of the IRMM-2329P, a uranium micro particle reference material. This certification project was a joint cooperation between the International Atomic Energy Agency (IAEA-SGAS, Austria), the Forschungszentrum Jülich (FZJ) and the Joint Research Centre (JRC-Geel, unit G.2). The material was produced in compliance with ISO/IEC 17034:2016 and certified in accordance with ISO Guide 35:2006. Between-unit homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006 [2]. Uncertainties of the certified values were estimated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM). In order to achieve "fit for purpose" isotope ratios for particle analysis, the base material IRMM-2329 was prepared by volumetric mixing of two uranium nitrate solutions, which were prepared by hydrolysis and nitration of uranium hexafluoride (UF6). These two UF6 materials were selected out of the UF6 library available at the JRC in Geel. Certification of the isotopic composition was done by Thermal Ionisation Mass Spectrometry (TIMS) using the Modified Total Evaporation (MTE) method. Production of the uranium particles was done at the FZJ using the vibrating orifice aerosol generator (VOAG). Verification measurements of the base solution and ‘process control measurements’ on the uranium particles were performed at the IAEA-SGAS via Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS). Besides the isotopic composition, also the uranium content and mass per particle is certified by ID Thermal Ionisation Mass Spectrometry (TIMS) and confirmed by MC ICPMS Moreover, the certified values were established using new published values for the atomic masses and applying a 2-digit rounding rule. The materials are intended for the calibration of instruments, methods, quality control purposes, and the assessment of method performance for isotope mass spectrometry on uranium particles. As with any certified reference material, they can also be used for validation studies.
JRC Directorate:Nuclear Safety and Security

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