Low-level radioactivity measurements in an ocean shellfish matrix

Reference marine biological samples are necessary to test the performance o f the analytical methods employed in surveying and monitoring radioactive m aterials in the sea. The measurement of artificial and natural radionuclide activity concentrations in ocean shellfish material by nondestructive ultr a low-level gamma-ray spectrometry in an underground laboratory is reported . The material analysed, a composite material made of Irish Sea and White S ea mussel and Japan Sea oyster, was prepared by the National Institute of S tandards and Technology (NIST). (C) 2000 Elsevier Science Ltd. All rights r eserved.