Effects on Ecosystem
ＱHow is the concentration of radioactive cesium in marine species changing?
ＡConcentration of radioactive cesium in marine species is decreasing over time. This is because the concentration of cesium in seawater has decreased. Radioactive cesium desorbed from marine sediment may affect demersal fish.
- Marine fish have the ability to quickly discharge cesium and the other minerals from their bodies. When the concentration of radioactive cesium in seawater decreases, the concentrations in marine fish also decrease.
- The tendency of decrease in concentration of radioactive cesium in demersal fish is similar to that in marine sediment. This means that the radioactive cesium in demersal fish is possibly affected by marine sediment.。
- 水産庁, “水産物の放射性物質調査の結果について”
- 乙坂重嘉, 海底堆積物中の放射性セシウム濃度の推移, ISOTOPE NEWS, No.710, p.12-15.
- Otosaka, S. et al, Sedimentation and remobilization of radiocesium in the coastal area of Ibaraki, 70 km south of the Fukushima Dai-ichi Nuclear Power Plant, Environmental Monitoring Assessment, vol.185, no.7, 2013, p.5419–5433.