Study on decontamination for cesium polluted soils by a chlorination-volatilization method

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The experimental studies on removal of cesium by a chlorination-volatilization method were carried out for the decontamination of the polluted soils generated in the nuclear accident. Before the chlorination experiments, we tried to investigate the properties of cesium distribution towards particle sizes classifications of the sample soils collected in Fukushima prefecture. The soil particles were highly precisely classified into nano-meter sizes, and evaluated the radioactivies of cesium 137 and 134 using high purity germanium detector. On the base of the results, the applicability of the chlorination-volatilization method was evaluated employing bentonite sample composed of particles smaller than 5 um which was contribute most to cesium adsorption onto soils. As the result, it was found that the higher temperature over 900 C was effective that it may enhance the volatilization amount of cesium larger than 100 times larger than without its chlorination.