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- W1513682783 abstract "A joint monitoring study between the Radiation and Nuclear Safety Authority (STUK) and the Finnish Game and Fisheries Research Institute (FGFRI) on the radioactivity of forest lakes in Evo, Southern Finland, was started in summer 1987. Besides fish, lake water and other biota, such as zooplankton, larvae of various insects and aquatic plants, were analysed from these lakes. Soil samples from the lake catchments were also analysed in 1988 – 1989. In 1992, samples of bottom sediment were analysed from one lake for 137Cs. In addition, fish from the Finnish Acidification Research Project of FGFRI from several small forest lakes in 1986 – 1989 were analysed for 137Cs. The results obtained in the joint study of STUK and FGFRI are gathered in this report. The highest activity concentrations of 137Cs in fish were about 30 000 Bq / kg (w.w.) in 1987 in pike from Lake Iso Valkjarvi, which is a clear-water seepage lake having no natural inlet or outlet. Variation in the activity concentrations of 137Cs in fishes in small forest lakes in the area receiving the highest deposition in Finland has remained large since the Chernobyl deposition. Interspecific differences in 137Cs levels of fish were consistent with their trophic position in the food webs. Ten-fold interlake differences in 137Cs contents of lake water were noted within the same municipality in 1987. In the bottom sediment of Lake Iso Valkjarvi, 95% of 137Cs was present in the uppermost 10 cm and about 70% in the uppermost 3 cm in 1992. The total amount of 137Cs detected in the sediment profile was only a quarter of the average deposition in the municipality of Lammi measured by Arvela et al. (1990). Average values for 137Cs in soil in the catchments of five lakes as Becquerels per unit area were clearly higher than the average value for the deposited 137Cs in the municipality of Lammi determined by Arvela et al. (1990). An aquatic plant, the yellow iris, was the most effective 137Cs accumulator of all the organisms studied, having a bioconcentration factor of 115 000 on a dry weight basis. Some other plants and fish were also efficient accumulators of 137Cs." @default.
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- W1513682783 date "2009-01-01" @default.
- W1513682783 modified "2023-09-26" @default.
- W1513682783 title "137 Cs in small forest lakes of Finland after the Chernobyl accident" @default.
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