Radioactivity Dynamics in River System
（2015）
ＱDo dose rates in riverbeds increase after heavy rains? 【Tendency of the change of air dose rate】
ＡSurface dose rates increase and decrease readily depending upon the deposition and erosion of sediment at specific locations. But on the whole, air dose rates at such locations tend to decrease gradually.
- Investigations in the Ukedo River, Fukushima Prefecture, have revealed that surface dose rates fluctuate at places where cesium readily deposits. Air dose rates are also affected at such spots, but tend to be unaffected over the wider region.
- At all measurement spots, from upstream to downstream along the Ukedo River, averaged values of air dose rates tend to decrease over time.
- Similar tendencies were observed in the other rivers in eartern Fukushima Prefecture (Hamadori District).
Fig.1 Time dependence of averaged air dose rate at each measurement spot in the riverbed of the Ukedo River
Fig.2 Time dependence of surface & air dose rates in the riverbeds in the downstream Ukedo River (near the Ukedo River bridge on Route 6)
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