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Report No.

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

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

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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