Radioactivity Dynamics in forests
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.
Fig.1 Example for time-dependence of dose rates at the lower end of a slope
Fig.2 Measurement of radiation dose rate (Kainosaka, Kawauchi Village)
- When it rains, does radioactive cesium flow out of forests with soil? 【Tendency of the change of the 137Cs concentration in soil】
- When it rains, does radioactive cesium flow out of forests with soil? 【Relationship between the coverage rate of forest floor and flowing rate from forests】
- Do dose rates in riverbeds increase after heavy rains? 【Difference between high and low water channels】
- Do dose rates in riverbeds increase after heavy rains? 【Tendency of the change of air dose rate】
- Does the concentration in river water change before and after forest fire? How did it change by time?