Radioactivity Dynamics in forests
（2017）
ＱWill clean areas be contaminated due to radioactive cesium flowing out of forests?
ＡDose rates at the ground surface may tentatively increase due to outflow of soil and leaves from forests. However, air dose rates are not affected by such overflow.
- 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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