A Three-Dimensional Stochastic Model of the Behaviors of Radionuclides in Forests. II. Cs-137 Behavior in Forest Soils

The long-term behavior of cesium-137 in forest soils was simulated using a previously developed three-dimensional stochastic model. The model assumes that infiltration of the soil solution and sorption to the soil matrix drive the advection and dispersion processes, which in turn determine the behavior of Cs super(137) in soils. The uptake and release of Cs super(137) by forest vegetation is modeled in an additional paper. Models of the hydrological cycle of the forest are developed to estimate water infiltration rates; these models accommodate the processes of infiltration, evapotranspiration, and root uptake. Models of water distribution in forests are used to predict the state transition probabilities for the random walk model of Cs super(137) transport.