Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-617 - C1-620|
|Published online||25 March 2010|
Regional variation of 137Cs in freshwater fishes in Finland
STUK, Radiation and Nuclear Safety Authority, Research and Environmental Surveillance, P.O. Box 14, 00881 Helsinki, Finland
The aim of this study was to see if differences in the transfer and behaviour of 137Cs in fishes can be found in large fishery areas. Based on watercourses the country can be divided into eight large areas. The study is focused mainly to four of these areas, most important for freshwater fishing in Finland and based on long-term analysing programmes of freshwater fishes carried out after the Chernobyl deposition in each area. Deposition from Chernobyl was distributed most unevenly in Finland. Average depositions of 137Cs to the areas studied varied from 4 kBq/m2 to 34 kBq/m2. The transfer of 137Cs into fishes differed somewhat in various areas. Regional averages of 137Cs in fishes per unit deposition varied between 0.04 to 0.2 m2/kg. Average concetration ratios of 137Cs in predatory, non-predatory and intermediate fish and water were 7000, 2400 and 6200, respectively, in 1998. After peak values 137Cs in fishes decreases with a half-life of 2.2 - 7.5 years in the four large fishery areas. The type of the catchment plays an important role in the long-term behaviour of 137Cs both in surface water and in fishes.
© EDP Sciences, 2002
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