Derivation of super(137)Cs Deposition Density from Measurements of super(137)Cs Inventories in Undisturbed Soils

Scientists documented cesium 137 inventories for samples of undisturbed soils from 292 sites located throughout Vietnam. Logarithmic inventory data were then regressed against the features of the sampling locations, including geographical coordinates, annual rainfall, and the physico-chemical parameters of the soils. Roughly 76% of observed variations in logarithmic inventory values across the country could be explained by a regression model containing latitude and annual rainfall as determinants. Evidence indicated that the latitude mean super(137)Cs deposition density increases northward from 237 Bq/m super(2) to 1097 Bq/m super(2). These values are compared against values determined from the UNSCEAR global pattern. The highest inputs of super(137)Cs were identified in high-rainfall regions in northern and central sections of Vietnam.