Title: European Measurement Comparisons of Environmental Radioactivity
Authors: WAETJEN UWE
Citation: The Nuclear Proficiency Testing - AIP Conference Proceedings 1036 p. 85-99
Publisher: American Institute of Physics
Publication Year: 2008
JRC N°: JRC44689
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC44689
Type: Contributions to Conferences
Abstract: The scheme of European measurement comparisons to verify radioactivity monitoring in the European Union is briefly explained. After a review of comparisons conducted during the years 1990, the approach of IRMM organising these comparisons since 2003 is presented. IRMM is providing comparison samples with a reference value traceable to the SI units and which is fully documented to all participants and national authorities after completion of the comparison. The sample preparation and determination of traceable reference values at IRMM, the sample treatment and measurement in the participating laboratories, as well as the evaluation of comparison results are described in some detail using the example of an air filter comparison. The results of a comparison to determine metabolised 40K, 90Sr and 137Cs in milk powder are presented as well. The necessary improvements in the estimation of measurement uncertainty by the participating laboratories are discussed. The performance of individual laboratories which have participated in at least four comparison exercises over the years is studied in terms of observable trends.
JRC Institute:Institute for Reference Materials and Measurements

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