Elution characteristics of Cs and Sr in heat-treated soil

After the accident of Fukushima Daiichi nuclear power plant, decontamination work has been carried out. Soil containing radioactive materials such as Cs is present in the decontamination waste. It is necessary to understand the behavior of radioactive substances in case of the incineration of waste. Therefore, in this study, the dissolution test was carried out using heat-treated soils containing Cs and Sr. The result showed that the elution rate of Cs decreased with increasing heat treatment temperature, and that there was almost no difference between the number of wet/dry cycles. It is considered that Cs was fixed in the soil by the heat treatment. The second result was that the elution rate of Sr increased with increasing the heat treatment temperature, and that this rate after 2- wet/dry cycles was lower than after 1- wet/dry cycle. It is highly possible that less Cs in the decontamination waste containing soil is eluted in the environment because of the fixation of Cs in soil by the heat treatment. (author)