広域環境モニタリングのための航空機を用いた 放射性物質拡散状況調査
広域環境モニタリングのための航空機を用いた 放射性物質拡散状況調査
広域環境モニタリングのための航空機を用いた 放射性物質拡散状況調査
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JAEA-Technology 2012-036<br />
Investigation of Radionuclide Distribution Using Aircraft for Surrounding Environmental Survey from<br />
Fukushima Dai-ichi Nuclear Power Plant<br />
Tatsuo TORII, Yukihisa SANADA, Takeshi SUGITA *1 , Atsuya KONDO *2 , Yoshiaki SHIKAZE,<br />
Masaki TAKAHASHI, Mutsushi ISHIDA ※1 , Yukiyasu NISHIZAWA ※2 and Yoshimi URABE ※1<br />
Fukushima Environmental Safety Center<br />
Headquarters of Fukushima Partnership Operations<br />
Japan Atomic Energy Agency<br />
Uchisaiwai-cho, Chiyoda-ku, Tokyo<br />
(Received October 17, 2012)<br />
We carried out aerial radiation monitoring (ARM) of all Japan area in order to investigate the<br />
influence of the radio cesium which was emitted into the atmosphere by disaster of the Fukushima Dai-ichi<br />
nuclear power plant of Tokyo Electric Power Co., Inc.. AMS can measure a gamma ray quickly by flight<br />
from 300 m height above the ground. Moreover, ARM has an advantage which can grasp self-possessed<br />
quantity distribution of an air dose rate and radioactive cesium in "field", and is visually intelligible.<br />
Although there were apparatus and the technique of ARM in our country, sufficient preparations for<br />
wide area monitoring were not made. Therefore, it fixed based on the method of the U.S. Department of<br />
Energy (DOE) about the method of the conversion to all radiation dose, and the conversion method to<br />
radiocesium deposition and the method of mapping.<br />
It is possible to discriminate from a background (cosmic-ray, self-contamination and natural nuclides)<br />
at the time of western-part-of-Japan measurement by improving of the method in parallel to data<br />
acquisition.<br />
By this monitoring, it was able to check about the distribution situation of the air dose rate of the<br />
Japanese whole region, or the radioactive cesium deposition. Here, the measurement technique and a result<br />
are described.<br />
Keywords: Aerial Radiation Monitoring, Radiation Survey, Fukushima Dai-ichi Nuclear Power Plant,<br />
Radiocesium, Map, Natural Nuclide<br />
This report was summarized for results that JAEA carried out as commissioned business by "Investigation<br />
of radionuclide distribution using aircraft for surrounding environmental survey from Fukushima Daiichi<br />
nuclear power plant" of the Ministry of Education, Culture, Sports, Science and Technology.<br />
※1<br />
Collaborating Engineer (NESI CO. Ltd.)<br />
※2<br />
Collaborating Engineer (VIC CO. Ltd.)<br />
*1<br />
NAIS CO. Ltd.<br />
*2<br />
NESI CO. Ltd.<br />
ii