Title: Evaluation of the 2017 EC Proficiency Test on 131I, 134Cs and 137Cs in maize powder
Publisher: Publications Office of the European Union
Publication Year: 2020
JRC N°: JRC118790
ISBN: 978-92-76-17330-4 (online)
ISSN: 1831-9424 (online)
Other Identifiers: EUR 30142 EN
OP KJ-NA-30142-EN-N (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC118790
DOI: 10.2760/54966
Type: EUR - Scientific and Technical Research Reports
Abstract: A proficiency test (PT) on the measurements of I-131, Cs-134 and Cs-137 in maize powder was organised by European Commission Directorate-General (EC DG) Joint Research Centre in Geel on request of the EC DG for Energy. This PT was an integral part of the EC's work of realising verification of Member State's obligations towards Article 35 of the Euratom Treaty. It serves also as a quality control programme which JRC-Geel is coordinating in order to assess the quality of the results collected in the Radioactivity Environmental Monitoring (REM) database. The PT reference material was prepared by spiking blank maize powder. The samples were sent to 123 laboratories of which 120 laboratories submitted their results. The evaluation of the PT results was performed according to ISO 13528:2015. The zed (z) and zeta (ζ) and En scores, were calculated. The z scores of the reported results for I-131 were acceptable for 92% of laboratories. For both Cs-134 and Cs-137 they were acceptable for 94% laboratories. The ζ scores were satisfactory for 66%, 56% and 68% of results for I-131, Cs-134 and Cs-137 respectively. In case of En score the number of consistent results was the same as for ζ score.
JRC Directorate:Nuclear Safety and Security

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