Radioactivity Dynamics in forests
ＱHow does the concentration of radioactive cesium in trees change with time? Is radioactive cesium gradually absorbed into trees from roots?
ＡConcentration of radioactive cesium in each part of a tree is changing over time Concentration of radioactive cesium in trees has not changed so much as the years go on. There is no evidence that trees positively absorb radioactive cesium.
- Concentration of radioactive cesium in each part of a tree is changing with time. Concentration of radioactive cesium in tress of Japanese cedar forests in Kawauchi Village, Otama Village, and Tadami Town, Fukushima Prefecture has been investigated. As a result, it was elucidated that most of the cesium has been remaining in soil and litter layers since 2012.
- When trees absorb radioactive cesium after the accident, concentration of radioactive cesium in trees is considered to increase. According to the results obtained in above districts, the concentration of radioactive cesium inside of trees is generally still low. So there is no evidence that trees positively absorb cesium.
- Does the concentration of radioactive cesium deposited in mountain forests vary by altitude and location?
- How do air dose rates in forests change with time?
- Do sediment with high radioactive cesium concentration continue to be deposited on river bottoms?
- Is there a continuous input of cesium contamination to rivers from forests?
- How much did the amount or the concentration of Cs released to river water by forest fire? How did them change by time?