Abstract
The interaction of contaminated fresh water sediment with the marine environment is one of the important processes taking place in estuaries. Sediments contaminated by discharges from nuclear facilities situated upstream of rivers may eventually reach the estuary zones where Kd values may change dramatically for some radionuclides. In order to gain a better understanding of radionuclide behaviour in river systems and in estuarine processes, a 'naturally' contaminated river sediment has been used in a laboratory study of 'passive diffusion' from sediment cores to fresh water and sea water under similar physical conditions. The sediment contains up to 1000 kBq.kg -1 dry weight of 137 Cs and about ten times less of 90 Sr and 239,240 Pu. The results for 137 Cs show that the distribution coefficient, K d , decreases with at least a factor of 4-7 if this fresh water sediment comes into contact with high salinity sea water.
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