Radioactivity Dynamics in River System
（2015）
ＱDoes contamination of estuaries continue due to continuous outflow of radioactive cesium from rivers?
ＡThe concentration of 137Cs in estuary sediment is lower than river sediment.
- In estuary of river, the concentration of 137Cs in sandy sediment is lower than river sediment.
- The concentration of 137Cs in silty sediment is higher than riversediment, however it is lower than riverbed.
- Investigation about movement and abundance of 137Cs in March - Novenber, 2011 reported inflow from river is low.
Fig.1 Estimated distribution of sediment species at the bottom of the Ukedo River estuary. Sampling spots are shown in the map
Vertical distribution of radioactive cesium in the sediment at the bottom the Ukedo River estuary (Sampling time：October 2015)
Fig.2 137Cs concentration（kBq/kg dry weight）
Reference: T. Kobayashi et al., Model development of material dynamics in the ocean, Briefing session of research result of JAEA; Actions for environmental remediation of Fukushima (2017 Nov)
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