Once radionuclides enter the eco-system, they move around carried by wind and water. They can’t “go away.” They can’t be “decontaminated.” They can only be moved, the biggest force moving them is nature, not clean up crews.

Ogaki Dam in Namie, Fukushima Prefecture, as seen from a Mainichi Shimbun helicopter in July 2016, contains high concentrations of radioactive cesium exceeding the limit set for designated waste.

High levels of radioactive cesium pooling at dams near Fukushima nuke plant

High concentrations of radioactive cesium have been accumulating at the bottom of 10 major dams within a 50-kilometer radius from the disaster-stricken Fukushima No. 1 Nuclear Power Plant, a survey by the Environment Ministry has found.

Radioactive cesium emanating from the 2011 nuclear disaster is pooling at those dams, which are used to hold drinking water and for agricultural use, after the substances flew into there from mountains, forests and rivers. The…