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Shikaze, Yoshiaki; Shimazoe, Kenji*
Journal of Nuclear Science and Technology, 59(1), p.44 - 54, 2022/01
Times Cited Count：3 Percentile：45.99(Nuclear Science & Technology)A Compton camera system for use on an unmanned helicopter was previously developed for characterizing the distribution of radioactive materials in highly contaminated areas. For this study, a small camera, a laser distance meter, an attitude angles sensor, temperature sensors, and real-time monitoring software were equipped to the Compton camera system to better measure flight parameters and to more precisely detect hot spot locations. To confirm if detection results were improved by the modifications, measurements were taken from hovering and programmed flights over a field in Okuma, Fukushima Prefecture (Japan). Ambient dose equivalent rate distributions at ground level were obtained by processing the flight data, then compared against measurements taken at ground level on foot using a survey meter. For one hovering flight, the correlation between the datasets was improved by selecting a period of stable flight position and attitude, and by restricting the deviation of the attitude angles. Between 6.0%-7.6% improvement in the position resolution was achieved by using the data from stable flight periods, even when using 1 minute data windows. The precision of hot spot detections and ambient dose equivalent rate distributions obtained from the Compton camera were thus improved by the aforementioned modifications to the system.
Bains, R.S.*; Sugimoto, Jun
JAERI-Research 94-007, 66 Pages, 1994/08
JAERI-Research-94-007.pdf:3.03MB
no abstracts in English
Maruyama, So; Murakami, Tomoyuki*; Fujii, Sadao*; Fujimoto, Nozomu; Tanaka, Toshiyuki; Sudo, Yukio; Saito, Shinzo
Proc. of the 1st JSME/ASME Joint Int. Conf. on Nuclear Engineering,Vol. 1, p.425 - 430, 1991/00
no abstracts in English
Shikaze, Yoshiaki; Torii, Tatsuo; Shimazoe, Kenji*; Jiang, J.*; Takahashi, Hiroyuki*; Kurosawa, Shunsuke*; Kamada, Kei*; Yoshikawa, Akira*; Yoshino, Masao*; Ito, Shigeki*; et al.
no journal, ,
no abstracts in English
Shikaze, Yoshiaki; Torii, Tatsuo; Nishizawa, Yukiyasu; Yoshida, Mami*; Shimazoe, Kenji*; Jiang, J.*; Takahashi, Hiroyuki*; Kurosawa, Shunsuke*; Kamada, Kei*; Yoshikawa, Akira*; et al.
no journal, ,
no abstracts in English
Oda, Yoshihiro; Dohi, Terumi; Kanaizuka, Seiichi*; Iijima, Kazuki
no journal, ,
We make a research to understand the detailed distribution of radioactive caesium deposition on mountain forests around Fukushima Dai-ichi Nuclear Power Plant. By the research data, we analysed the relations between dose rate and landform by using geographical information system.
Dohi, Terumi; Fujiwara, Kenso; Kikuchi, Naoyuki; Hagiwara, Hiroki; Iijima, Kazuki
no journal, ,
no abstracts in English
Muto, Kotomi; Dohi, Terumi; Yoshimura, Kazuya; Kanaizuka, Seiichi*; Iijima, Kazuki
no journal, ,
no abstracts in English
Shikaze, Yoshiaki; Shimazoe, Kenji*
no journal, ,
no abstracts in English
Shikaze, Yoshiaki
no journal, ,
no abstracts in English
Kawahara, Rika*; Ochi, Kotaro; Yamaguchi, Katsuhiko*; Torii, Tatsuo*
no journal, ,
Currently, the difficult-to-return zones are being lifted, and it is important to determine the radiation distribution. However, Compton cameras can only provide two-dimensional radiation information, and it is impossible to determine the distance to hot spots. Therefore, in order to obtain a more detailed distribution of radiation sources, we combined a Compton camera and an optical camera to create a three-dimensional distribution map of source locations and their intensities. Two locations in the difficult-to-return zone (Okuma Town) were surveyed: a park parking lot and the vicinity of a private home. The distribution of air dose rates was determined by measurement with a survey meter with a wand-type GPS (Gamma Plotter H manufactured by Japan Radiation Engineering Co). Measurements were taken with a Compton camera (H420, H3D, USA) at several different positions and angles toward the hot spots. An optical camera (GoPro) was used to create three-dimensional images of the measurement site. The relationship between the air dose rate readable from the radiation source distribution map taken by the Compton camera and the distance from the hotspot was obtained.
