Results of an EC laboratory comparison on ⁴⁰K, ⁹⁰Sr and ¹³⁷Cs in dried bilberry powder
1European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Geel, Belgium.
Abstract:
The evaluation is presented of a laboratory comparison (LC) on (90)Sr, (40)K and (137)Cs in dried bilberries organised in 2011 by the IRMM. The activity concentrations reported by 88 participant laboratories are compared to the reference values of the new reference material IRMM-426 Wild Berries. Nine per cent and 17% of activity concentration results for (137)Cs and (40)K, respectively, deviate more than 20% from the reference values, a result worse than that obtained in previous LCs. For (90)Sr, about 88% of results lie within 30% of the reference value, better than observed in previous LCs. But only 58% of (90)Sr results are satisfactory in terms of the En criterion, indicating difficulties with a complete uncertainty estimation.
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