The Distribution of Cs-137 in Some Watersheds in the Eastern United States

Abstract
The areal concentration of 137Cs in 13 watersheds soils in the eastern USA ranged from 49-147 nCi/m2. The areal concentration of 137Cs in the sediments in the reservoirs controlling the watershed ranged from 39 to 532 nCi/m2. The buildup of 137Cs in the sediment was 0.8-8.7 times the concentration of 137Cs in the watershed soils on an areal basis which indicated that the reservoirs are acting as sinks or traps for the 137Cs moving in the watershed. Stepwise multiple regression showed that only 4-6 environmental variables were required to account for a significant percentage of the variation in 137Cs in the soils or sediments between watersheds. Developing models to predict 137Cs movement in watersheds on a regional basis are possible.

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