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In 1992 the concentration of radiocaesium in the surface layer of bottom sediment of 52 lakes of southern Finland was found to have declined on average to 27.4% of 1987-88 levels and to 25.7, 28.0 and 38.6% of 1988 levels in the tissues of perch, pike and roach, respectively. The sediment radiocaesium concentration was higher in larger lakes and in lakes having a large catchment, but lower in oligotrophic...
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