title: IRMM-1000a and IRMM-1000b uranium reference materials certified for the production date. Part I: methodology, preparation and target characteristics.
abstract: The paper describes the preparation and production of the reference materials, IRMM-1000a and IRMM-1000b, certified for the production date based on the230Th/234U radiochronometer in compliance with ISO Guide 34:2009. The production date of the reference materials corresponds to the last separation of230Th from234U, i.e. when the initial daughter nuclide content in the material was finally removed. For the preparation low-enriched uranium was used, which was purified using a unique methodology to guarantee high U recovery and Th separation efficiency. The CRM is intended for calibration, quality control, and assessment of method performance in nuclear forensics and safeguards.
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany.
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Varga
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium.
authors.forename: Célia
authors.initials: C
authors.lastname: Venchiarutti
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany.
authors.forename: Adrian
authors.initials: A
authors.lastname: Nicholl
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany.
authors.forename: Judit
authors.initials: J
authors.lastname: Krajkó
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium.
authors.forename: Rožle
authors.initials: R
authors.lastname: Jakopič
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany.
authors.forename: Klaus
authors.initials: K
authors.lastname: Mayer
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium.
authors.forename: Stephan
authors.initials: S
authors.lastname: Richter
authors.affiliation: European Commission, Joint Research Centre (JRC), Institute for Reference Materials and Measurements, Retieseweg 111, 2440 Geel, Belgium.
authors.forename: Yetunde
authors.initials: Y
authors.lastname: Aregbe
keywords: Age dating; Certified reference material; Nuclear safeguards and forensics; Radiochronometry; Uranium
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