On Thursday, the environmental group released a report addressing the results of the study during which scientists analyzed radioactivity levels along Fukushima’s rivers and in the Pacific seabed off the coast.
The vast territories including contaminated forests and freshwater systems “will remain a perennial source of radioactivity for the foreseeable future,” scientists warned in the press release.
They analyzed the level of radioactive materials, such as Cesium-134 and Cesium-137 (Cs-137), noting a colossal increase in the figures.
While the amount of Cs-137 in seabed near the Fukushima plant was only 0.26 Bq/kg prior to the nuclear disaster, the current number stands at 120 Bq/kg, the report showed. On the whole, the data showed that Cs will pose a threat to human health for hundreds of years to come.
“The radiation levels in the sediment off the coast of Fukushima are low compared to land contamination, which is what we expected and consistent with other research,” said Kendra Ulrich, senior global energy campaigner at Greenpeace Japan.
The current site of the destroyed plant “remains one of the greatest nuclear threats” to Fukushima communities and the Pacific Ocean, the group said.
“The hundreds of thousands of tonnes of highly-contaminated water, the apparent failure of the ice wall to reduce groundwater contamination, and the unprecedented challenge of three molten reactor cores all add up to a nuclear crisis that is far from over,” said Ulrich.
Greenpeace also warned against the government’s decision to lift a number of evacuation orders around the Fukushima plant by March 2017.
The Fukushima Daiichi nuclear disaster, the largest since the 1986 Chernobyl disaster, took place in March 2011 and resulted in three nuclear meltdowns and a leak of radioactive materials. The accident prompted a nationwide shutdown of all nuclear power plants in Japan with Sendai being the first to start working again, in August 2015.