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 Investigation of Radionuclide Distribution Using Aircraft for Surrounding Environmental Survey from Fukushima Dai-ichi Nuclear Power Plant Tatsuo TORII, Yukihisa SANADA, Takeshi SUGITA *1 , Atsuya KONDO *2 , Yoshiaki SHIKAZE, Masaki TAKAHASHI, Mutsushi ISHIDA ※1 , Yukiyasu NISHIZAWA ※2 and Yoshimi URABE ※1 Fukushima Environmental Safety Center Headquarters of Fukushima Partnership Operations Japan Atomic Energy Agency Uchisaiwai-cho, Chiyoda-ku, Tokyo (Received October 17, 2012) 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 gamma 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. Keywords: Aerial Radiation Monitoring, Radiation Survey, Fukushima Dai-ichi Nuclear Power Plant, Radiocesium, Map, Natural Nuclide This report was summarized for results that JAEA carried out as commissioned business by "Investigation of radionuclide distribution using aircraft for surrounding environmental survey from Fukushima Daiichi nuclear power plant" of the Ministry of Education, Culture, Sports, Science and Technology. ※1 Collaborating Engineer (NESI CO. Ltd.) ※2 Collaborating Engineer (VIC CO. Ltd.) *1 NAIS CO. Ltd. *2 NESI CO. Ltd. ii
JAEA-Technology 2012-036 目次 1. はじめに .................................................................................................................................................... 1 2. 航空機モニタリングの経緯 ..................................................................................................................... 2 3. 航空機モニタリングシステム ................................................................................................................. 7 3.1 MEXT システム ............................................................................................................................. 7 3.2 NUSTEC システム ........................................................................................................................ 8 3.3 OYO システム ............................................................................................................................... 9 3.4 FUGRO システム .......................................................................................................................... 9 3.5 システムの比較 ........................................................................................................................... 10 3.5.1 点線源によるレスポンス確認 ............................................................................................... 10 3.5.2 リファレンスライン ............................................................................................................... 12 3.6 計算コードによる MEXT システム特性評価 .......................................................................... 14 4. データ採取及び解析方法 ....................................................................................................................... 17 4.1 事前確認 ....................................................................................................................................... 17 4.1.1 検出器の健全性確認 ............................................................................................................... 17 4.1.2 機体の汚染確認 ....................................................................................................................... 17 4.1.3 ヘリコプタの機底の遮蔽 ....................................................................................................... 18 4.2 データ採取方法 ........................................................................................................................... 20 4.2.1 ヘリコプタの選定 ................................................................................................................... 20 4.2.2 フライト方法 ........................................................................................................................... 24 4.2.3 テストライン ........................................................................................................................... 25 4.2.4 結果の妥当性確認のための地上測定 ................................................................................... 26 4.3 解析方法 ....................................................................................................................................... 26 4.3.1 線量換算係数(CD) ................................................................................................................... 27 4.3.2 空気減弱係数(AF) ................................................................................................................... 31 4.3.3 線量率-放射能換算係数 .......................................................................................................... 33 4.3.4 バックグラウンドの減算方法 ............................................................................................... 33 4.3.5 海抜高度による宇宙線の影響 ............................................................................................... 37 4.3.6 Rn 子孫核種の影響 ................................................................................................................. 37 4.3.7 減衰補正 ................................................................................................................................... 39 4.3.8 検出下限値及び信頼性 ........................................................................................................... 40 4.3.9 全線量率の検出下限 ............................................................................................................... 40 4.3.10 全線量率換算の不確かさ ....................................................................................................... 41 4.3.11 放射性 Cs の沈着量の検出下限 ............................................................................................. 43 4.3.12 放射性 Cs の沈着量の不確かさ ............................................................................................. 43 iii
Page 2 and 3: 本レポートは独立行政法
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JAEA-Technology 2012-036 Table 4-7
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JAEA-Technology 2012-036 4-8 に、
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JAEA-Technology 2012-036 2012-036 I
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5.1 線量率マップ JAEA-Technol
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JAEA-Technology JAEA-Technology 201
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JAEA-Technology JAEA-Technology 201
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Radiocesium deposition by AMS(kBq/m
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JAEA-Technology 2012-036 Table 6-1
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鳥居峠 6.4 海抜高度と放射
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6.5 降雪の影響 JAEA-Technology
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6.6.1 北海道 JAEA-Technology 201
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JAEA-Technology 2012-036 - 68 - Fig
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JAEA-Technology 2012-036 中~後期
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6.6.3 関東地方 JAEA-Technology
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6.6.4 中部地方 JAEA-Technology
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JAEA-Technology 2012-036 下での
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6.6.9 南西諸島 Fig. 6-19 に南
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JAEA-Technology 2012-036 16) 長岡
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A1-4. 議事録件名航空機
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3. JAEA-Technology 2012-036 (6)航
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JAEA-Technology 2012-036 (眞田)
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件名航空機モニタリング
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JAEA-Technology 2012-036 (長岡委
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A1-5. 配布資料 (1)第一回会
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・MEXT-1 (DOE) 測定器 Fig. A2-1
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Fig. A2-13 Attenuation coefficient
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・MEXT-3 測定器 Fig. A2-22 Atte
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・NUSTEC 測定器 Fig. A2-32 Atte
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・OYO 測定器 Fig. A2-43 Attenua
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・FUGURO 測定器 Fig. A2-52 Atte
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Fig. A2-64 Attenuation coefficient
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・MEXT-3 JAEA-Technology 2012-036
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Cs-index ①東日本 JAEA-Technolo
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JAEA-Technology 2012-036 Fig. A3-28
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② 西日本実施時 JAEA-Technol
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Pref. No. date lat. long. JAEA-Tech
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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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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