Abstract
External exposure from 137Cs deposited on surface soil is one of the important exposure pathways during an accident at nuclear facilities. In this study, a validation of a dose assessment model of that pathway was carried out by using the monitoring data of the concentration of 137Cs in the surface soil layers around the Chernobyl nuclear power plant. It was obtained that the dose estimation by using the 2-component removal model from soil surface, which is generally used for dose assessment, is useful as the results of comparison with a compartment model in which the effect of vertical migration of nuclides in soil layers is considered. It was found that the ratio of rapid component is the most important parameter in the model, and that the values change from about 0.09 to 0.69 in the monitoring area.
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