チェルノブイリ原子力発電所事故　　新潟市におけるフォールアウト核種の同定

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  • The reactor accident at Chernobyl': Identification of radionuclides in fallout in Niigata city.
  • チェルノブイリ ゲンシリョク ハツデンショ ジコ ニイガタシ ニ オケル フォ

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The fallout caused by the accident of Chernobyl' nuclear reactor has been monitored in Niigata City (April 30-June 3, 1986) . Twelve nuclides (131I, 132I, 129Te, 129mTe, 132Te, 134Cs, 136Cs, 137Cs, 103Ru, 99mTc, 140La, 140Ba) were identified in aerosol samples. The same nuclides plus 7Be were identified in rain-water. Gaseous and particle-bound 131I were separately trapped on a glass filter and a charcoal filter, respectively. Results indicate 50-60% of atmospheric 131I is gaseous and the rest is particlebound. Chloroform extraction of rain-water revealed that 40-60% of 131I in the rain-water sample exists in the form of IO3- and 131IO3- (131IO4-) /131I- seemed to increase with the lapse of time after the accident.

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