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核燃料サイクル開発機構東海事業所における環境放射線モニタリング

Environmental radiological monitoring around JNC Tokai works

中野 政尚; 磯崎 徳重; 武石 稔

Nakano, Masanao; Isozaki, Tokuji; Takeishi, Minoru

東海再処理施設(TRP)の運転による環境放射線モニタリングをこれまで25年間以上にわたって実施するとともに、公衆に対する被ばく線量を算出してきた。環境放射線モニタリングとして、種々の陸上・海洋試料、例えば空気中浮遊じん, 表土, 精米, 葉菜, 牛乳, 海水, 海底土, 魚類, 貝類, 海藻などを採取し、$$^{3}$$H, $$^{14}$$C, $$^{90}$$Sr, $$^{131}$$I, $$^{137}$$Cs, $$^{239,240}$$Pu の放射化学分析を行った。TRPからの放出によって、短期間での大きな放射線上昇や長期間の蓄積は確認されなかった。そのため、放射性物質の放出データと気象データを用いた線量計算モデルによって公衆の被ばく線量を評価した。年間実効線量はICRP(国際放射線防護委員会)が勧告する年間実効線量限度の約0.1%と評価された。

The regional environmental radiation monitoring and the dose calculation for the public were performed for the past 25-year operation of the Tokai Reprocessing Plant (TRP). For the environmental monitoring, various kinds of terrestrial and marine samples including air dust, surface soil, polished rice grain, leafy vegetable, milk, seawater, seabed sediments, fish, shellfish and seaweed were collected in the surrounding environment of the TRP. Radionuclides such as $$^{3}$$H, $$^{14}$$C ,$$^{90}$$Sr, $$^{131}$$I, $$^{137}$$Cs and $$^{239,240}$$Pu in the environmental samples were determined by radiochemical methods. However, they showed no significant short-term increase or long-term accumulation of radionuclides discharged from the TRP. Therefore, the public dose was evaluated by the mathematical models using the discharge data of radionuclides and the meteorological data. The estimated annual effective dose for the public was about 0.1% of the annual effective dose limit recommended by the ICRP.

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