• Investigation in Kawauchi Village, Fukushima Prefecture has revealed that changes in surface dose rates at 1 cm height are caused by radioactive cesium adsorbed on soil and leaves tentatively accumulating in ditches.
• Data obtained in Kawauchi Village have also shown that even if surface dose rates tentatively increase, its effect on air dose rates at 1 m height is small.
• Investigation in Kawauchi Village, Namie Town, and Kawamata Town has revealed that both air dose rates and surface dose rates are decreasing based on the physical decay of the nuclides.

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  Fig.1　Example for time-dependence of dose rates at the lower end of a slope

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  Fig.2　Measurement of radiation dose rate (Kainosaka, Kawauchi Village)

Fig.3　Image for soil tranceportation, sedimentation,and effect of radiation

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