福島第一原子力発電所事故後10年間の陸域における¹²⁹Iの研究成果まとめ

抄録

Iodine 129 (¹²⁹I) is a radionuclide that decays to ¹²⁹Xe with a half-life of 15.7 million years. The analysis of ¹²⁹I in the environment has played an important role not only in the fields of planetary science and earth science, but also in the nuclear field in recent years. Particularly, in the case of the Fukushima Dai-ichi Nuclear Power Plant accident in March, 2011, the scientists estimated the distribution and soil deposition of ¹³¹I over a wide area, and contributed to the assessment of internal exposure doses in the early stage of the accident. This is one of the most significant achievements in recent ¹²⁹I-related studies. Future studies are expected to be conducted to elucidate the transport mechanism of ¹²⁹I from land to river and sea, and to investigate the possible accumulation of ¹²⁹I in aquatic organisms. The mobility of ¹²⁹I in the soil studied by the author during the 10-years since the accident has been mainly reviewed in this manuscript.