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Journal Articles

A Compilation of the 10-year studies on $^{129}$ I in the terrestrial environment after the Fukushima Dai-ichi Nuclear Power Plant accident

Honda, Maki

Chikyu Kagaku, 55(4), p.176 - 192, 2021/12

https://doi.org/10.14934/chikyukagaku.55.176

Iodine 129 ( $^{129}$ I) is a radionuclide that decays to $^{129}$ Xe with a half-life of 15.7 million years. The analysis of $^{129}$ I 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 $^{131}$ I 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 $^{129}$ I-related studies. Future studies are expected to be conducted to elucidate the transport mechanism of $^{129}$ I from land to river and sea, and to investigate the possible accumulation of $^{129}$ I in aquatic organisms. The mobility of $^{129}$ I in the soil studied by the author during the 10-years since the accident has been mainly reviewed in this manuscript.

Journal Articles

Towards enhancing Fukushima environmental resilience

Miyahara, Kaname

Transactions of the American Nuclear Society, 117(1), p.51 - 52, 2017/10

This presentation highlights JAEA's challenges for contributing to recovering the previous life of residents and the development of resilient communities in Fukushima Prefecture based on considering needs of local people on the environmental restoration categorized by the state of evacuation orders and the lifting of such orders.

Journal Articles

Migration mechanisms of $^{237}$ Np and $^{241}$ Am through loess media

Tanaka, Tadao; Mukai, Masayuki; Maeda, Toshikatsu; Matsumoto, Junko; Ogawa, Hiromichi; Li, Z.*; Wang, X.*; Fan, Z.*; Guo, L.*; Liu, C.*

Journal of Radioanalytical and Nuclear Chemistry, 256(2), p.205 - 211, 2003/05

https://doi.org/10.1023/A:1023916829838

Times Cited Count：3 Percentile：25.75(Chemistry, Analytical)

Migration experiments of $^{237}$ Np(V) and $^{241}$ Am(III) have been performed using a column system, to investigate migration behavior of Np and Am through a column packed with loess, taken from Shanxi, China. Adsorption mechanisms of Np and Am on the loess were examined by a chemical extraction method. In the case of the Np, most of Np adsorbed on the influent edge of the column. The Np adsorbed on the loess was mainly controlled by surface complexation. However, the migration of Np in the loess media could be roughly evaluated by using the distribution coefficient. In the case of the Am, particulate Am species was formed in the influent solution and moved in the column. The Am adsorbed on the loess was controlled by irreversible reactions. The migration behavior of particulate Am in the loess media could be expressed by the filtration theory.

JAEA Reports

Research on treatment and disposal of RI and research institute waste; Progress in Department of Fuel Cycle Safety Research

Department of Fuel Cycle Safety Research

JAERI-Review 2001-019, 108 Pages, 2001/07

JAERI-Review-2001-019.pdf:6.04MB

Department of Fuel Cycle Safety Research, JAERI, has been carrying out research on safe and rational disposal systems of radioactive wastes arising from medical activities and research institutes (RI and Research Institute Waste). The research area includes a study on molten solidified waste form, a geological survey on Japan, a proposal on integrated disposal systems, data acquisition for safety evaluation, and a safety analysis of disposal systems. This report introduces progress and future works for the treatment and disposal of RI and Research Institute Waste.

JAEA Reports