||Radiocesium fate in the Japanese agricultural systems and the effect of soil remediation acts
Tagami, KeikoUchida, Shigeo
Environmental remediation acts have been started from April 2011 at local community units, just after the heavy releases of radionuclides from the Fukushima Daiichi Nuclear Power Plants. The measures were removal of surface soil, cut contaminated trees and remove grasses from public places, especially in kindergarten and school to decrease the radiation dose to children. After that, on 11 November 2011, the Japanese government made basic principles to implement the act on special measures to handle radioactive waste. Special decontamination area (SDA) and intensive contamination survey area (ICSA) were designated by the Ministry of the Environment and remediation acts have been carried out. Removed materials that exceeded 100 kBq/kg in ICSA will go to isolated-type landfill sites for hazardous industrial wastes located in each prefecture, and that in SDA will go to interim storage facilities. In January 2015, the area for interim storage facilities was selected and thus the remediation will move forward. During these remediation acts, a huge amount of soil and plant materials has been removed from agricultural fields and the amount is still increasing. It is, however, difficult to remove all contamination from soil and indeed still radiocesium remained in the agricultural soils. In order to minimize radiocesium transfer to edible parts of crops grown in such soils, additional practical measures has to be applied in the agricultural fields. In this presentation, general information on remediation act and the remediation effect on crop production will be reviewed.