Analysis on the effect of forest decontamination on reducing the air dose rate using the three-dimensional transport code MCNP

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  • HEMMI Ko
    Waste Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency Environmental Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency
  • YAMAGUCHI Tetsuji
    Waste Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency
  • TAKEDA Seiji
    Environmental Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency
  • KIMURA Hideo
    Environmental Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency

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Other Title
  • 3次元輸送計算コードMCNPを用いた森林除染による空間線量率の低減効果の検討
  • 3ジゲン ユソウ ケイサン コード MCNP オ モチイタ シンリン ジョセン ニ ヨル クウカンセンリョウリツ ノ テイゲン コウカ ノ ケントウ

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<p>  Conditions of contaminated sources and ranges of forest decontamination that effectively reduce the air dose rate in residential areas were investigated by means of an analysis related to the decontamination of the forest contaminated by radiocesium deriving from the accident at Fukushima Daiichi Nuclear Power Station. The contaminated sources including 134Cs and 137Cs were assumed to be a layer of sedimented organic matter (the A0 layer) and surface soils (the A1 layer). The air dose rates were calculated using the three-dimensional Monte Carlo transport code MCNP. A slope number of the forest, state of contaminant distribution, radiocesium content in the forest soils, slope angles of the forest soils, decontamination ranges, distance from the forest boundary to an evaluation point, and height at the evaluation point were adopted as the parameters. The decontamination of a litter (A0) layer within the distance of 20 m from the forest boundary was revealed to be effective in reducing the air dose rate when the source distribution was homogeneous. The air dose rates were significantly reduced by the decontamination of the A0 layer within a distance of 40 m from the forest boundary on condition that the radiocesium content of the A0 layer was larger than that of the A1 layer and the source distribution was non-homogeneous, such as the forest areas beyond 20 m from the forest boundary, which were more heavily contaminated than those within 20 m.</p>

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