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  • 1 Commission of the European Communities Community Bureau of Reference (BCR) Ruede de la Loi 200 1049 Brussels (Belgium)
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Abstract  

Reference materials are necessary to improve or to maintain a high quality of analysis. To avoid bias as far as possible, the BCR certifies reference materials on the basis of results of different methods used by different laboratories. A proper selection of good methods and laboratories makes it possible to obtain excellent agreement and narrow confidence intervals. Neutron activation techniques are suited for many key elements; their results are in good agreement with those of other techniques.