A massive amount of soils and inflammable materials of plants etc. contaminated by radiocesium are generated from decontamination work in the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident affected area. In present study, the removal experiments of ¹³⁷Cs in a soil collected from the FDNPP accident affected area were carried out in a lab-scale electrical heating horizontal furnace through thermal treatment with CaCl₂ addition over a temperature of 900 – 1300 °C. The results indicated that the average radioactive concentration of ¹³⁷Cs in the soil was 52.8 Bq/g. The removal ratio of ¹³⁷Cs in the soil treated at 1300 °C was 96.3% when 20% CaCl₂ was added. The addition of CaCl₂ and CaO mixture exhibited a synergistic effect on the removal of ¹³⁷Cs, relative to the addition of CaCl₂ alone. Accordingly, the addition of CaCl₂ or its mixture with CaO during thermal treatment is suggested to remove ¹³⁷Cs in the soil collected from the FDNPP accident affected area. Additionally, segregation of the soil sample to fine and coarse fraction and then treated individually are also recommended.

福岛第一核电站事故受灾地区的净化工作产生了大量被放射性铯污染的土壤和植物等易燃材料。在本研究中，从FDNPP事故影响地区收集的土壤中¹³⁷ Cs的去除实验是在实验室规模的电加热卧式炉中进行的，该炉在900 – 1300°C的温度下添加CaCl _2进行热处理。结果表明，土壤中¹³⁷ Cs的平均放射性浓度为52.8 Bq / g。添加20％CaCl ₂时，在1300°C处理的土壤中¹³⁷ Cs的去除率为96.3％。CaCl _2的添加相对于单独添加CaCl ₂，CaO混合物对¹³⁷ Cs的去除具有协同作用。因此，建议在热处理过程中添加CaCl ₂或其与CaO的混合物以去除从FDNPP事故影响区域收集的土壤中的¹³⁷ Cs。此外，还建议将土壤样品分离成细颗粒和粗颗粒，然后分别处理。