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Kurikami, Hiroshi; Niizato, Tadafumi; Tsuruta, Tadahiko; Kato, Tomoko; Kitamura, Akihiro; Kanno, Mitsuhiro*; Kurosawa, Naohiro*
JAEA-Research 2016-020, 50 Pages, 2017/01
JAEA-Research-2016-020.pdf:6.02MB
In this report, we developed a compartment model of radionuclide migration in environment based on exposure pathways in a river basin scale and performed a preliminary calculation. The results showed good agreement with some measurement, although the comparison of bed sediment, transportation to outer sea and to agricultural products with the measurement was not enough. We continue to validate the model.
Kitamura, Akihiro; Kurikami, Hiroshi; Yamaguchi, Masaaki; Oda, Yoshihiro; Saito, Tatsuo; Kato, Tomoko; Niizato, Tadafumi; Iijima, Kazuki; Sato, Haruo; Yui, Mikazu; et al.
Nuclear Science and Engineering, 179(1), p.104 - 118, 2015/01
Times Cited Count：8 Percentile：55.87(Nuclear Science & Technology)The prediction of the distribution and fate of radioactive materials eventually deposited at surface in the Fukushima area is one of the main objectives and expected to be achieved in an efficient manner. In order to make such prediction, a number of mathematical models of radioactive contaminants, with particular attention on cesium, on the land and in rivers, lakes, and estuaries in the Fukushima area are developed. Simulation results are examined with the field investigations simultaneously implemented. The basic studies of the adsorption/absorption mechanism of cesium and soils have been performed to shed light on estimating distribution coefficient between dissolved contaminant and particulate contaminant.
Kuroda, Tomoko*; Fukuyama, Ryota*; Kitamura, Satoshi*; Matsuo, Yoji*; Ikeda, Naoshi*; Kambe, Takashi*; Agui, Akane; Kimizuka, Noboru*
no journal, ,
no abstracts in English
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Fukuyama, Ryota*; Yoshii, Kenji; Kuroda, Tomoko*; Kitamura, Satoshi*; Funae, Takeshi*; Matsuo, Yoji*; Ikeda, Naoshi*; Kimizuka, Noboru*; Kambe, Takashi*
no journal, ,
We have investigated the physical properties of LuFeO, which has a related structure to the electronic ferroelectric RFeO (R: rare earths). Magnetic measurements showed that its magnetic transition temperature was about 260-270 K. Dielectric measurements showed that dielectric constants at room temperature were about 10000. This material also showed a magneto-dielectric effect at around room temperature, a result which is interesting from the viewpoints of both fundamental and applied science.
Saito, Tatsuo; Yamaguchi, Masaaki; Kato, Tomoko; Oda, Yoshihiro; Kitamura, Akihiro
no journal, ,
In our project entitled "Long-term Assessment of Transport of Radioactive Contaminant in the Environment of Fukushima" (F-TRACE project), we have been simulating radioactive Cs transport by watershed models. Based on these predictions, we evaluate a 1-cm dose equivalent rate with PHITS (Particle and Heavy Ion Transport code System) in a selected environment and present the results attained thus far.
Saito, Tatsuo; Yamaguchi, Masaaki; Kato, Tomoko; Oda, Yoshihiro; Kitamura, Akihiro
no journal, ,
It has already passed nearly three years since the accident of a Fukushima Dai-ichi Nuclear Power Plant (FDNPP). Now, the main nuclide which is contributing to radiation dose rate is radioactive caesium (
Cs and 
Cs, hereafter, radioactive Cs). Predicting the distribution of radioactive Cs deposited in the soil surface of Fukushima Prefecture after the accident and understanding the adsorption/desorption mechanism between soil and radioactive Cs in the environment are indispensable for evaluating the impact of radiological exposure dose. Primary transportation mechanism of radioactive Cs is considered to be in the form of soil erosion on the land surface and sediment-sorbed contaminants transport in the water system. In our project entitled "Long-term Assessment of Transport of Radioactive Contaminant in the Environment of Fukushima" (F-TRACE project), we have been simulating radioactive Cs transport by watershed models. Based on these predictions, we evaluate a 1-cm dose equivalent rate with PHITS (Particle and Heavy Ion Transport code System) in a selected environment and present the results attained thus far.
Kurikami, Hiroshi; Niizato, Tadafumi; Tsuruta, Tadahiko; Kato, Tomoko; Kitamura, Akihiro; Kanno, Mitsuhiro*; Kurosawa, Naohiro*
no journal, ,
To understand environmental fate of radioactive materials released from nuclear accidents is important for recovery measures. We have developed a compartment model including all important compartments and processes to describe environmental fate of radioactive materials and have applied to the Fukushima environment. The results showed a good agreement with field investigations.
Seki, Akiyuki; Suzuki, Kenta*; Akazaki, Tomohiko*; Tamori, Kiyomi; Kitamura, Tomoko; Sugiyama, Noriko; Saito, Kimiaki; Takemiya, Hiroshi
no journal, ,
There has been a growing demand for knowing time series changes in air dose rate and concentration of radioactive materials. Also, from the beginning of the accident, there were a lot of requests for local monitoring information specialized in the area where individuals live or want to know. To respond to those requests, we had improved and developed the information systems using software platform for environmental monitoring data which developed already. Several visualization information that made time series changes easier to understand were added to the Environmental Monitoring Database. Also, we had developed the Environmental Monitoring Infographics which statistically analyzes a large amount of environmental monitoring data and visualizes the change of air dose rate and concentration of radioactive materials. Moreover, we developed the Mapping Tool that can map and graph local environmental monitoring information.
