Radioactivity Dynamics in River System
ＱIs there a continuous input of cesium contamination to rivers from forests?
ＡThe concentration of radioactive cesium flowing from forests into mountain streams tends to decrease with time.
- Investigations in Kawamata Town, Fukushima Prefecture have revealed that most radioactive cesium (more than 90%) flowing from forests into mountain streams is adsorbed on suspended materials
- In all of the rivers investigated, the concentration of radioactive cesium in the dissolved state and that adsorbed on suspended materials or coarse organic matter tends to decrease with time
Reference： Report on the Project for the Nuclear Regulatory Agency, “Data Accumulation for Distribution of Radioactive Materials Released from Fukushima Daiichi Nuclear Power Station, TEPCO and Development of Migration Model” (FY 2014).
- Do sediment with high radioactive cesium concentration continue to be deposited on river bottoms?
- Does contamination of estuaries continue due to continuous outflow of radioactive cesium from rivers?
- Where is radioactive cesium deposited in forests, and how much? How do the locations and amounts change over time?
- Does the concentration in river water change before and after forest fire? How did it change by time?