A photograph taken from an Asahi Shimbun helicopter shows the Edogawa river emptying into Tokyo Bay.
June 7, 2018
Radioactive cesium from the crippled Fukushima No. 1 nuclear power plant continued to flow into Tokyo Bay for five years after the disaster unfolded in March 2011, according to a researcher.
Hideo Yamazaki, a former professor of environmental analysis at Kinki University, led the study on hazardous materials that spewed from the nuclear plant after it was hit by the Great East Japan Earthquake and tsunami on March 11, 2011.
Five months after disaster caused the triple meltdown at the plant, Yamazaki detected 20,100 becquerels of cesium per square meter in mud collected at the mouth of the Kyu-Edogawa river, which empties into Tokyo Bay.
In July 2016, the study team detected a maximum 104,000 becquerels of cesium per square meter from mud collected in the same area of the…
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20 millisieverts per year 