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Saegusa, Jun; Yoda, Tomoyuki; Murakami, Mitsuhiro; Takeishi, Minoru
no journal, ,
no abstracts in English
Kurita, Yoshiyuki; Okazaki, Tsutomu; Maeda, Satoshi; Yoda, Tomoyuki; Saegusa, Jun
no journal, ,
no abstracts in English
Tsujimura, Norio; Yoshida, Tadayoshi; Hoshi, Katsuya
no journal, ,
no abstracts in English
Shimoyama, Iwao; Hirao, Norie; Baba, Yuji; Izumi, Toshinori; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi
no journal, ,
We propose a low-pressure sublimation method as a new dry method for reduction of radioactive soil pollutant in Fukushima. We applied heat treatment for weathered biotite saturated and sorbed with 
Cs. Thermogravimetric analysis in low-pressure environment showed a mass decrease due to Cs desorption around 750-800 
C, which was not observed in air. Thermal desorption spectroscopy (TDS) showed Cs desorption peak at 680 C in high vacuum environment. This peak shifted to low-temperature side by about 200 C by heating with NaCl-CaCl
mixed salt. X-ray fluorescence (XRF) analysis clarified that only negligible amount of Cs was retained in the weathered biotite after heating with the mixed salt at 700 C for two hours. On the other hand, about one-third of Cs can be removed without the salt. These results demonstrated that low-pressure sublimation method can decontamination of Cs from clay minerals using lower temperatures than those for conventional dry methods.
Nagasu, Ryosuke*; Yoshida, Masafuyu*; Naganawa, Hirochika; Yanase, Nobuyuki; Nagano, Tetsushi; Mitamura, Hisayoshi; Komatsuzaki, Shoichi*; Kumazawa, Noriyuki*
no journal, ,
A new method for easily removing of radioactive cesium from muck soil in forests has been developed. Fine particles of bentonite having negative charge and high adsorbing ability for cesium can effectively adsorb radioactive cesium, and then, the bentonite fine particles can aggregate and being trapped by interaction with interpolyelectrolyte complex having positive charge, which enables an easy removal of radioactive cesium from muck soil in forests.
Miyahara, Kaname
no journal, ,
This presentation provides a concise overview of knowledge and experience gained from the activities for environmental remediation after the Fukushima Daiichi accident. The assessment of the natural behaviour of contaminant radionuclides in the environment is focused almost entirely on radiocaesium. Many of the conditions in Fukushima are similar to those following past contamination events in other countries, where natural self-cleaning alone has allowed recovery to such an extent that the original incident is now largely forgotten. Decontamination efforts in Japan will certainly accelerate this process. On-going remediation work is based on a good technical understanding of the movement of radiocaesium in the environment and this understanding is being translated into actions that enable the rapid return of evacuees and assures that they can safely resume their previous lifestyles. It does, however, need to be better communicated to the general public and other key stakeholders.