Greenpeace sediment sampling in Abukuma river, Miyagi prefecture, February 2016. The Abukuma has a 5,172km2 catchment15 which is largely in Fukushima prefecture, before entering the Pacific ocean in Miyagi prefecture. Greenpeace / Raquel Monton
Radioactive contamination in the seabed off the Fukushima coast is hundreds of times above pre-2011 levels, while contamination in local rivers is up to 200 times higher than ocean sediment, according to results from Greenpeace Japan survey work released Thursday.
“The extremely high levels of radioactivity we found along the river systems highlights the enormity and longevity of both the environmental contamination and the public health risks resulting from the Fukushima disaster,” Ai Kashiwagi, energy campaigner at Greenpeace Japan, said.
“These river samples were taken in areas where the Abe government is stating it is safe for people to live. But the results show there is no return to normal after this nuclear catastrophe,” said Kashiwagi.
Riverbank sediment samples taken along the Niida River in Minami Soma, measured as high as 29,800 Bq/kg for radiocaesium (Cs-134 and 137). The Niida samples were taken where there are no restrictions on people living, as were other river samples. At the estuary of the Abukuma River in Miyagi prefecture, which lies more than 90km north of the Fukushima Daiichi plant, levels measured in sediment samples were as high as 6,500 Bq/kg.