The adsorption pattern of radioactive cesium in the soil of litter removed secondary forests and agricultural fields

Abstract

The adsorption pattern of radioactive cesium (¹³⁷Cs) in soil of forests and agricultural fields derived from Fukushima Daiichi NPP accident was investigated using sequential extraction experiment. There was little soluble ¹³⁷Cs. Exchangeable and organic matter bound ¹³⁷Cs were 13% in organic horizon and 9% in surface of mineral soil in agricultural fields, whereas 3% and 2% respectively in forests. Most of ¹³⁷Cs hardly move in ecosystem regardless of the organic matter content. Radioactivity of ¹³⁷Cs in the surface of mineral soil was decreased by organic matter removal, but the ratio of exchangeable and organic matter bound ¹³⁷Cs increased.