Title: Evaluation of EC Measurement Comparison for 137Cs, 40K and 90Sr in Milk Powder
Authors: WAETJEN UWESPASOVA YANAALTZITZOGLOU TIMOTHEOSEMTEBORG HAKANPOMME STEFAAN
Publisher: OPOCE
Publication Year: 2008
JRC N°: JRC43803
ISBN: 978-92-79-08500-0
ISSN: 1018-5593
Other Identifiers: EUR 23270 EN
OPOCE LA-NA-23270-EN-C
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC43803
DOI: 10.2787/32777
Type: EUR - Scientific and Technical Research Reports
Abstract: This report describes the full life cycle of the measurement comparison of 137Cs, 40K and 90Sr in milk powder among 60 European laboratories monitoring radioactivity in food and the environment. An available IAEA reference material was re-processed at IRMM into suitable intercomparison samples and the homogeneity of the distributed samples together with other quality parameters was determined. Reference values of the three radionuclides under study in this intercomparison were determined at IRMM using tracer techniques and standardised radionuclide solutions and are thus traceable to the SI units. The sample preparation and measurement processes applied in the participating laboratories are described and the results of the intercomparison are presented and discussed in detail. Whereas, in general, the measurement results for 137Cs and 40K show good agreement with the reference value, the results of this comparison point at problems of 90Sr determination in about one third of the laboratories. The corresponding participants should investigate and revise their analytical methods, next to many laboratories needing to improve their estimation of measurement uncertainty.
JRC Institute:Institute for Reference Materials and Measurements

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