Abstract
Lakes and forests are as important to humans as they are providers of drinking water, fish, berries, mushroom, game, and wood. Following the Chernobyl accident, these semi-natural ecosystems have exhibited persistently high contamination levels of radiocaesium, also in the prealpine region of southern Germany. For the past 12 years, the time-dependency of the bioavailability of radiocaesium has been studied for different lakes and forests in order to get an understanding of the persistence and the migration of radiocaesium in semi-natural environments and for radiation protection purposes. As a measure of the time-dependency, the effective half-time and the ecological half-time will be discussed for Cs-137 concentrations and for Cs-137 aggregated transfer factors, respectively.
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