〈論文〉福島県川俣町における環境放射線調査

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Hohara, Sin-ya[Abstract] Large amount of radioactive materials had released by the nuclear power plant accident at Fukushima Dai-ichi site. The level of radiation dose rate has been raised by the radioactive material on the ground. We measured the dose rates in Kawamata-machi, Fukushima-ken, Japan, which is located about 40 km from the power plant in north-west direction. We measured the Cs-137 concentration in soil samples by the Gediode detector. The result shows more than 90％ of Cs-137 exists the depth from the surface to 10 mm. The soil of shallow depth was sieved to 6 series by particle size. The radioactivity of the parts less than 1 mm diameter account for more than 80％ of the total. The Cs-137 in soil was not solved by water.