チェルノブイルからの放射性物質が日本の西南地域の牛乳および牧草中の131Iおよび137Cs濃度に及ぼした影響

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  • The Effect of the Radionuclides from Chernobyl on Iodine-131 and Cesium-137 Contents in Milk and Pastures in South-western Japan
  • チェルノブイル カラ ノ ホウシャセイ ブッシツ ガ ニホン ノ セイナン チイ

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Iodine-131 concentrations (concns) in milk and grass in the Kyushu district in south-western Japan after the Chernobyl nuclear power plant accident reached the highest levels of 116.5 pCi/l (4.3 Bq/l) and 1764.0 pCi/kg on May 11 and May 10, 1986, respectively, and then they fluctuated with time and decreased slowly. Iodine-131 concn in the milk could not be detected on May 30 but that in the grass, it was still 379.4pCi/kg on June 2, 1986. When cows were given high cesium-137 contaminated hay with 333.1 pCi/kg ad. libitum, cesium-137 concn in the milk reached a steady state on the 8th day after the start of the contaminated hay feeding (Expt 1). When given the diet with an amount of 672.4 pCi per day, cesium-137 concn in the milk of cows showed approximately 2 pCi/l, while cesium-137 concns in the milk ranged from 9.7 to 10.9 pCi/l when the diet was taken, including high cesium-137 contaminated Italian ryegrass hay, with an amount of 3, 409.9 pCi per day (Expt 2). The transfer coefficient of cesium-137 from diets to milk were 0.38 and 0.31 in Expts 1 and 2, respectively.

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