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The aim of the work was to determine  241 Pu activities in different components (water, plankton and fish) of the southern Baltic Sea ecosystem. Measurement of  241 Pu in the samples was done indirectly by determining the increment in  241 Am from the decay of the  β -emitting  241 Pu in samples collected 10–15 years after the Chernobyl accident.

241 Pu concentrations in water, plankton and fish from the southern Baltic Sea