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Journal Articles

Development of radionuclide distribution database and map system on the Fukushima nuclear accident

Seki, Akiyuki; Takemiya, Hiroshi; Takahashi, Fumiaki; Saito, Kimiaki; Tanaka, Kei*; Takahashi, Yutaka*; Takemura, Kazuhiro*; Tsuzawa, Masaharu*

Progress in Nuclear Science and Technology (Internet), 4, p.47 - 50, 2014/04

The radionuclide distribution database and map system, which provide basic information for evaluations and countermeasures of the Fukushima nuclear accident, are explained. Due to massive earthquake and tsunami, Fukushima Dai-ichi Nuclear Power Plant has been damaged and had spread out radioactive materials around the Fukushima site. It is necessary to collect, analyze, and provide the information of radioactivity correctly and immediately. We developed two providing systems to identify the current distribution of released radionuclides and support decontamination activities.

Journal Articles

Thermal neutron spin-echo studies on dynamics of a glass-forming polymer in a high ${it Q}$ range

Kanaya, Toshiji*; Kakurai, Kazuhisa; Tsukushi, Itaru*; Inoue, Rintaro*; Watanabe, Hiroshi*; Nishi, Masakazu*; Nakajima, Kenji; Takemura, Kazuhiro*; Furuya, Hidemine*

Journal of the Physical Society of Japan, 74(12), p.3236 - 3240, 2005/12

 Times Cited Count:5 Percentile:37.34(Physics, Multidisciplinary)

We performed thermal neutron spin echo measurements on a glass-forming polymer, deuterated polybutadiene (-[CD$$_{2}$$-CD=CD-CD$$_{2}$$]$$_{n}$$-; PB-d$$_{6}$$), in a high ${it Q}$ range up to 3.5$AA $^{-1}$$ covering the first and second peaks of the structure factor S(${it Q}$), and evaluated the decay rate $$Gamma$$(${it Q}$) of the coherent intermediate scattering function as a function of ${it Q}$. In contrast to the previous experimental findings on the first peak of S(${it Q}$) at ${it Q}$ = 1.5$AA $^{-1}$$, no "de Gennes" type narrowing was observed on the second peak at ${it Q}$ = 2.9$AA $^{-1}$$. This novel finding indicates that the narrowing is hidden by the distinct motions of the soft -CD$$_{2}$$-CD$$_{2}$$- and =CD-CD$$_{2}$$- units and the self-motions of the rigid and soft units in the ${it Q}$ range around the second peak.

Oral presentation

Development of radioactive databases and contamination map system

Seki, Akiyuki; Takemiya, Hiroshi; Takahashi, Fumiaki; Saito, Kimiaki; Tanaka, Kei*; Takahashi, Yutaka*; Takemura, Kazuhiro*; Tsuzawa, Masaharu*

no journal, , 

Radioactive database and contamination map for the accident of Fukushima Dai-ichi Nuclear Power Plant are described. It is necessary to obtain precise data on the contamination conditions. Both systems have been developed to provide information to identify the current distribution of released materials and to support decontamination planning. The former is designed to provide quantitative data for detailed analysis, while another to provide intuitive images for the qualitative estimation. They contain air dose rates at around 2,200 locations within approximately 100 km from the plant, and radionuclide concentration data at each location. The vehicle-borne survey results are also included for the purpose of ascertaining the distribution of radioactive substances around roads in detail. All the data have been measured during the first investigation conducted in June, and the second in December 2011. The systems will become open to the public at the site of JAEA soon.

Oral presentation

Study on distribution of radioactive substances around Fukushima Dai-ichi Nuclear Power Plant, 4; Enhancement of databases for contamination maps

Seki, Akiyuki; Takemiya, Hiroshi; Saito, Osamu; Saito, Kimiaki; Tanaka, Kei*; Takahashi, Yutaka*; Takemura, Kazuhiro*; Tsuzawa, Masaharu*

no journal, , 

The system for saving and providing the data which are related to the radionuclides in Fukushima prefecture and the neighboring prefectures has been developed. The data mainly include the dose-rate and the analysis result of the soil and water samples. The Center for Computational Science and e-Systems developed the system under the study on distribution of radioactive substances around Fukushima Dai-ichi Nuclear Power Plant founded by MEXT. Proceeding with the installation of the data which are collected by MEXT and Fukushima prefecture, the system are being enhanced more.

Oral presentation

Construction of the database and map systems on the distribution of radioactive material

Seki, Akiyuki; Takemiya, Hiroshi; Takahashi, Fumiaki; Saito, Kimiaki; Tanaka, Kei*; Takahashi, Yutaka*; Takemura, Kazuhiro*; Tsuzawa, Masaharu*

no journal, , 

The construction of the database and map systems, which provide basic information for evaluations and countermeasures of the Fukushima nuclear accident, are explained. Fukushima Daiichi Nuclear Power Plant had been damaged and spread out radioactive materials around there on March 2011. There are still a lot of requests to know the distribution of radioactive material from government, local government, residents, and/or researchers. In order to meet those requests, we developed two systems to provide those data to the public. One of the systems is a database system which is designed to provide quantitative data for detailed analysis. Another is a map system which provides intuitive images for the qualitative estimation.

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