Abstract
Concentrations of239,240Pu and241Am in filtered seawater, particulate fraction and sediment were measured. Methods for determination of these nuclides were critically chequed and a new rapid method for241Am in sediment was developed. Due to seasonal variation a significant decrease of plutonium and americium concentrations in surface water takes place in summer. Americium is more efficiently associated with particulate matter than plutonium. From May 1980 to September 1984 soluble plutonium in the water was reduced to about half. The residence half-time of239,240Pu in the water of Baltic Sea is of the order of 5 years. About similar concentrations of239,240Pu and241Am were found in particulates in water as in the surface layer of the sediment. The average Kd-values for plutonium and americium were 105 and 105–106 ml/g, respectively.
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