Evaluation of the 2017 EC Proficiency Test on 131I, 134Cs and 137Cs in maize powder
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.
SOBIECH-MATURA Katarzyna;
LUTTER Guillaume;
VAN AMMEL Raf;
MARISSENS Gerd;
EMTEBORG Hakan;
HULT Mikael;
2020-04-30
Publications Office of the European Union
JRC118790
978-92-76-17330-4 (online),
1831-9424 (online),
EUR 30142 EN,
OP KJ-NA-30142-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC118790,
10.2760/54966 (online),
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