Abstract
Previous studies have shown that radionuclides of the transuranium elements plutonium, americium and curium have penetrated the sediment column in the N.E. Irish Sea to depths of at least half a metre. The distribution of 239,240Pu, 238Pu, 241Am, 244Cm and 242Cm concentrations and the 239,240Pu/ 238Pu quotient in samples taken in April and May 1983 from the sediment surface, burrow linings, sediment adjacent to burrows, and the gut contents and body of a large echiuran Maxmülleria lankesteri clearly indicate that bioturbation is responsible, at least in part, for the incorporation of these radionuclides to depths of up to 140 cm.
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