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Special environmental monitoring around Tokai-mura after the accident of the Fukushima Dai-ichi Nuclear Power Station

福島第一原子力発電所事故後の東海村における特別モニタリング結果

藤田 博喜; 永岡 美佳; 河野 恭彦; 竹安 正則; 川崎 将亜; 大倉 毅史; 辻村 憲雄; 住谷 秀一; 百瀬 琢麿; 古田 定昭

Fujita, Hiroki; Nagaoka, Mika; Kono, Takahiko; Takeyasu, Masanori; Kawasaki, Masatsugu; Okura, Takehisa; Tsujimura, Norio; Sumiya, Shuichi; Momose, Takumaro; Furuta, Sadaaki

福島第一原子力発電所事故が発生し、その事故により放出された放射性物質が、われわれの研究所まで到達し、その周辺における環境モニタリングを強化した。その特別モニタリングにおいては、線量率の監視,大気中塵埃及び降下塵の採取,測定を独自に行った。さらに、通常の環境モニタリングで行っている雨水や大気中水分についても分析を行った。幾つかの試料では、福島第一原発から放出された放射能を含んで$$^{90}$$Sr, $$^{131}$$I, $$^{134}$$Csや$$^{137}$$Csが検出された。また、通常の環境モニタリングとして行っている海水や海底土等でも福島原発事故の影響が見られた。

The nuclear accident at Fukushima Dai-ichi Nuclear Power Station of Tokyo Electric Power Co. (TEPCO) was caused by the Tohoku District-off the Pacific Ocean Earthquake. Various kinds of radionuclides were released from the power station right after the accident occurred and then reached our laboratories. Therefore, environmental monitoring was reinforced by observation of air absorbed dose rate, periodic collection of airborne dust, precipitation. The collected samples were used to determine radioactivity of $$gamma$$ ray emitters by High pure Germanium semiconductor detector. Moreover, rainwater and humidity were collected to do the usual routine monitoring. In some samples, $$^{90}$$Sr, $$^{131}$$I, $$^{134}$$Cs and $$^{137}$$Cs were detected with radioactivity released from the Fukushima station. In other samples such as seawater, seabed soil and etc., similar radionuclides were detected including the influence of the accident.

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