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Sasaki, Miyuki; Ishizaki, Azusa; Sanada, Yukihisa
no journal, ,
Since accident of the Fukushima Daiichi Nuclear Power Station (FDNPS), some unmanned vehicle was applied for radiation measurement around the FDNPS. JAEA is developing a method using a small multi-rotor helicopter (micro UAV) for measurement of radiation in the environment. The micro UAV is expected to be useful to measure the radiation distribution at small areas easily. In the conventional method, there are some premises to convert from count rate to dose rate at 1 m above the ground and they make it difficult to measure precise dose rate by airborne monitoring system at mountains and uneven places. Besides, the influence of the radiation from a structure and tree on the ground is not ignored at the low altitude less than 50 m that micro UAV can fly stably. In this study, the successive approximation method which is used in the medical radiation such as Positron Emission Tomography is attempted to apply to environmental radiation measurement.
Sato, Yuki; Ozawa, Shingo*; Terasaka, Yuta; Kaburagi, Masaaki; Miyamura, Hiroko; Tanifuji, Yuta; Kawabata, Kuniaki; Izumi, Ryo*; Suzuki, Toshikazu*; Torii, Tatsuo
no journal, ,
no abstracts in English
Sanada, Yukihisa; Sasaki, Miyuki; Mikami, Satoshi
no journal, ,
no abstracts in English
Sasaki, Miyuki; Sanada, Yukihisa
no journal, ,
In this study, we evaluated the field of view of airborne radiation survey which is obtained around the Fukushima Daiichi Nuclear Power Plant using the unmanned helicopter by comparison with a ground-based survey in the ambient dose rate. The field of view was evaluated from the convergence tendency of the error between airborne radiation survey value and ground-based measurement value. The convergence tendency of the error between the value of airborne radiation and the value of ground-based measurement was calculated by changing the mesh size. As a result, the field of view of airborne radiation survey at 50 m and 130 m altitudes were 100 m and 150 m mesh size respectively. These evaluation results are helpful for understanding the contour map of airborne radiation surveys. In addition, it is useful for the decision of flight conditions.