A 2ND INTERCOMPARISON OF RN-222 MEASUREMENT SYSTEMS IN EUROPEAN LABORATORIES

A recent intercomparison exercise (established under the auspices of E UROMET) involving seventeen laboratories was conducted by NPL, who gen erated and standardised a set of glass-encapsulated Rn-222 samples and then dispatched a unique subset of the samples to each participant. T he reported measured activities of the samples were normalised to the NPL values. The spread of results, for the laboratories who had partic ipated in an earlier exercise, was of the order of +/-5%; the results of 12 of the participants agreed at the 1 sigma level. Copyright (C) 1 996 Elsevier Science Ltd.