Study on Migration Behavior of Fallout Nuclides in Hinuma Lake(II). Development of a Transfer Model of Radiocesium.

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  • TAKEISHI Minoru
    Health and Safety Division, O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation
  • SHINOHARA Kunihiko
    Health and Safety Division, Tokai-works, Power Reactor and Nuclear Fuel Development Corporation (PNC)
  • NAKASHIMA Naoko
    Health and Safety Division, O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation

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Other Title
  • ひ沼におけるフォールアウト核種の移行挙動に関する研究（ＩＩ）　放射性セシウムの移行モデルの開発
  • ヒヌマ ニ オケル フォールアウト カクシュ ノ イコウ キョドウ ニカンスル
  • Development of a Transfer Model of Radiocesium
  • 放射性セシウムの移行モデルの開発

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Abstract

A transfer model has been developed to facilitate the environmental monitoring of fallout (Cesium-137) in a lake system. The transfer of radionuclides between zones (i. e., catchment area, lake water, lake bed sediment and fish) was modeled using standard differential equations. Radionuclide transfer velocities between zones were calculated and expressed as a function of rainfall intensity and periodic tidal effects based on observations in Hinuma Lake, Japan. Parameter perturbation analysis of the model showed: (a) 137Cs concentrations in the lake water (Cw) increased due to the deposition of 137Cs in the lake and 137Cs inflow from the catchment area; (b) Cw fluctuates due to the dilution of lake water by precipitation (i. e. Cw decreases) and subsequent inflow of 137Cs from the catchment area (i. e., Cw increases); (c) Cw increases due to rolling-up of particles of sediments carrying 137Cs when precipitation increases the current velocity in the lake; and (d) cyclic fluctuation of the flow rate with the tidal level causes variations in Cw.

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