Abstract
A small group of analysts from several United Kingdom laboratories meets regularly to share expertise in environmental radiochemical measurements. A number of intercomparison exercises are undertaken, one of which is described in this paper. This involved the determination of 238U, 235U, 234U, 226Ra and 210Pb in an Irish Sea sediment. Brief details of the preparation, homogeneity testing and analytical procedures used by each participant are provided. The results are considered in relation to the analytical methods used, particularly the initial extraction or dissolution of the sample matrix. Potential interference from artificial radionuclides is also discussed.
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