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Sanada, Yukihisa; Kondo, Atsuya*; Sugita, Takeshi*; Nishizawa, Yukiyasu; Yuki, Yoichi*; Ikeda, Kazutaka*; Shoji, Yasunori*; Torii, Tatsuo
Exploration Geophysics, 45(1), p.3 - 7, 2014/11
Times Cited Count：34 Percentile：71.34(Geochemistry & Geophysics)The Great East Japan Earthquake on March 11, 2011 generated a series of large tsunami waves that resulted serious damage to the Fukushima Daiichi Nuclear Power Plant (NPP) and a large amount of radioactive materials were discharged from the NPP to the environment. In recent years, technologies for an unmanned helicopter have been developed and applied to various fields. In expectation of the application of the unmanned helicopter to airborne radiation monitoring, we had developed a radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas. Here, we reports on the measurement technique and the result.
Sanada, Yukihisa; Sugita, Takeshi; Nishizawa, Yukiyasu; Kondo, Atsuya*; Torii, Tatsuo
Progress in Nuclear Science and Technology (Internet), 4, p.76 - 80, 2014/04
The ambient dose-rate and the deposition concentration of radioactive cesium was measured by using helicopters in the whole area of Japan to investigate the influence of the radioactivity that released in the atmosphere due to the disaster of the Fukushima Daiichi NPP (Nuclear Power Plant), Tokyo Electric Power Company (TEPCO), occurred by the East Japan earthquake and tsunami on March 11, 2011. As a result, the deposition of radioactive cesium on the ground discharged from the Fukushima Daiichi NPP was obtained, and it was clarified that the scattered range of the cesium had been almost limited from the southern part of Tohoku to Kanto areas. The variation distribution of the dose-rate of Japan was also revealed in this measurement.
Sanada, Yukihisa; Nishizawa, Yukiyasu; Yamada, Tsutomu; Ikeda, Kazutaka*; Matsui, Masashi*; Tsuchida, Kiyofumi; Sato, Yoshiharu; Hirayama, Hirokatsu; Takamura, Yoshihide; Nishihara, Katsuya; et al.
JAEA-Research 2013-049, 129 Pages, 2014/03
JAEA-Research-2013-049.pdf:15.5MB
By the nuclear disaster of Fukushima Daiichi Nuclear Power Plant (NPP), Tokyo Electric Power Company (TEPCO), caused by the East Japan earthquake and the following tsunami occurred on March 11, 2011, a large amount of radioactive materials was released from the NPP. In recent years, technologies for autonomous unmanned helicopters (AUHs) have been developed and applied to natural disasters. In expectation of the application of the AUHs to aerial radiation monitoring, we had developed a remote radiation monitoring system. Then, we measured the radiation level by using unmanned helicopter in soil contaminated areas by radioactive cesium emitted from the NPP to evaluate ambient dose-rate distribution around the areas and to investigate the decontamination effect by the measurements before and after decontamination treatment. Here, we reports on the measurement technique and the result.
Torii, Tatsuo; Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya*; Shikaze, Yoshiaki; Takahashi, Masaki; Ishida, Mutsushi; Nishizawa, Yukiyasu; Urabe, Yoshimi
JAEA-Technology 2012-036, 182 Pages, 2012/12
JAEA-Technology-2012-036.pdf:41.89MB
We carried out aerial radiation monitoring (ARM) of all Japan area in order to investigate the influence of the radio cesium which was emitted into the atmosphere by disaster of the Fukushima Dai-ichi Nuclear Power Plant of Tokyo Electric Power Co., Inc.. AMS can measure a 
ray quickly by flight from 300 m height above the ground. Moreover, ARM has an advantage which can grasp self-possessed quantity distribution of an air dose rate and radioactive cesium in "field", and is visually intelligible. Although there were apparatus and the technique of ARM in our country, sufficient preparations for wide area monitoring were not made. Therefore, it fixed based on the method of the U.S. Department of Energy (DOE) about the method of the conversion to all radiation dose, and the conversion method to radiocesium deposition and the method of mapping. It is possible to discriminate from a background (cosmic-ray, self-contamination and natural nuclides) at the time of western-part-of-Japan measurement by improving of the method in parallel to data acquisition. By this monitoring, it was able to check about the distribution situation of the air dose rate of the Japanese whole region, or the radioactive cesium deposition. Here, the measurement technique and a result are described.
Sanada, Yukihisa; Kondo, Atsuya; Sugita, Takeshi; Torii, Tatsuo
Hoshasen, 38(3), p.137 - 140, 2012/12
We have measured the ambient dose-rate and the deposition amount of radioactive cesium by using four helicopters in the whole area of Japan to investigate the influence of the radioactivity that released in the atmosphere due to the disaster of the Fukushima Dai-ichi NPP (Nuclear Power Plant), Tokyo Electric Power Company (TEPCO), caused by the Tohoku-Pacific Ocean Earthquake and tsunami on March 11, 2011. We report on the measurement technique and the result.
; Sakakibara, Yasuhide; Nishida, Masaaki; kondou; Nagata, Takashi
ProVISION, Fall(39), p.30 - 37, 2003/00
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Torii, Tatsuo; Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya; Tanaka, Kei*
no journal, ,
no abstracts in English
Ito, Chikara; Sanada, Yukihisa; Ito, Keisuke; Kondo, Atsuya; Ishikawa, Takashi; Nakano, Hironobu; Nozaki, Tatsuo; Torii, Tatsuo; Notomi, Akihiro*
no journal, ,
no abstracts in English
Torii, Tatsuo; Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya; Tanaka, Kei*
no journal, ,
no abstracts in English
Kondo, Atsuya; Sanada, Yukihisa; Sugita, Takeshi; Torii, Tatsuo
no journal, ,
Sanada, Yukihisa; Kondo, Atsuya; Sugita, Takeshi; Yuki, Yoichi*; Torii, Tatsuo
no journal, ,
Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya; Torii, Tatsuo
no journal, ,
Torii, Tatsuo; Kondo, Atsuya; Sanada, Yukihisa
no journal, ,
Torii, Tatsuo; Sanada, Yukihisa; Sugita, Takeshi; Kondo, Atsuya; Tanaka, Kei*
no journal, ,
Sanada, Yukihisa; Torii, Tatsuo; Kondo, Atsuya; Ikeda, Kazutaka*; Yuki, Yoichi*
no journal, ,
no abstracts in English
Sanada, Yukihisa; Kondo, Atsuya*; Sugita, Takeshi; Torii, Tatsuo
no journal, ,
Torii, Tatsuo; Sanada, Yukihisa; Nishizawa, Yukiyasu; Kondo, Atsuya*; Shoji, Yasunori*; Ikeda, Kazutaka*
no journal, ,
Muramatsu, Toshiharu; Yamada, Tomonori; Nguyen, P. L.; Yoshiuji, Takahiro*; Kondo, Atsuya*; Furutani, Akira*
no journal, ,
no abstracts in English
