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More than 200 data sets from the literature of measured time series of activity concentrations and transfer factors concerning: (1) soil, green plants, mushrooms, and game in forests and (2) water, particulate matter, and fish in rivers, reservoirs and lakes in Europe have been analyzed. We used a sum of up to 3 exponential functions to evaluate ecological half-times (Teco). In fresh water systems we fitted lognormal distributions of Teco for 137 Cs (e.g. in the water of 32 European lakes, Teco1 = (0.3*2.2 ± 1 ) years and Teco2 = (5.7*3.9 ± 1 ) years as geometric mean value and standard deviation). Pronounced seasonal variations were observed in suspended matter of Lake Lugano, reflecting the bio-mass cycle of this lake. In forests, ecological half-times for 137 Cs can also be fitted by a lognormal distribution. For Central Europe Teco < 12 years. Extraordinarily high 137 Cs activity concentrations were observed recently in wild boar in Germany. For Eastern Europe the physical half-time is dominant and in some components of the ecosystem the activity concentration is still increasing.

Ecological half-times of137Cs and90Sr in forest and freshwater ecosystems

Ecological half-times of¹³⁷Cs and⁹⁰Sr in forest and freshwater ecosystems