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Oral presentation

An Accurate derivation of the air dose-rate and the deposition concentration distribution by aerial monitoring in a low level contaminated area

Nishizawa, Yukiyasu; Sugita, Takeshi*; Sanada, Yukihisa; Torii, Tatsuo

no journal, , 

For a precise assessment of the distribution of radioactive cesium dispersed over a wide area, one must accurately evaluate the background radiation due to natural radionuclides. We have developed a new method that accurately evaluates the spatial distribution of the background radiation in areas contaminated by radioactive cesium. Using the data from aerial monitoring, we analyzed such distribution while excluding the effect of radioactive cesium. This method made it possible to evaluate not only the precipitation of radioactive cesium with quite well accuracy, but also the spatial distribution of the natural radionuclides all over Japan.

Oral presentation

Radioactive sediment transport on Ogaki dam reservoir in Fukushima evacuated zone; Numerical simulation studies by 2-D river simulation code

Yamada, Susumu; Kitamura, Akihiro; Kurikami, Hiroshi; Machida, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Mathematical modeling of environmental dynamics in Fukushima Prefecture

Kitamura, Akihiro; Kurikami, Hiroshi; Oda, Yoshihiro; Nakama, Shigeo; Malins, A.; Yamada, Susumu; Okumura, Masahiko; Machida, Masahiko

no journal, , 

Radioactive cesium, which strongly adheres to soils, is one of the major concerns regarding health physics in Fukushima today. It migrates mainly by soil erosion and subsequent sediment transport within surface water during times of widespread flooding. In order to predict the future distribution and resulting air dose rate at any location in Fukushima, we have prepared a number of mathematical models for radioactive cesium transport with different space and time scales. In this presentation we cover our prediction methodology, ranging from sediment and radioactive cesium movement to resulting long term air dose rate changes. Specifically, we present simulation results of sediment movement and radioactive cesium migration using semi-empirical and physics based watershed models, and that of sediment and radioactive cesium behavior in dam reservoirs using one and two dimensional water system simulation models. We also present some simulation results on air dose rate at a particular location and compared with direct measurement value.

Oral presentation

Triggering of earthquake swarms following the 2011 Tohoku megathrust earthquake

Umeda, Koji; Asamori, Koichi

no journal, , 

Following the Mw 9.0 Tohoku-Oki earthquake, an unusual, shallow normal-faulting swarm sequence occurred near the Pacific coast in the southeast Tohoku district. An integrated approach combining geophysical and geochemical methods was utilized to establish the presence of aqueous fluids around the seismic source region and their derivation.

Oral presentation

Fission-track dating using LA-ICP-MS; A Case study from Western Balkanides, Bulgaria

Balkanska, E.*; Tagami, Takahiro*; Sueoka, Shigeru; Georgiev, S.*; Kounov, A.*; Hasebe, Noriko*; Tamura, Akihiro*

no journal, , 

no abstracts in English

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