The estimate of much higher levels of radioactive caesium-137 in the atmosphere comes from a worldwide network of sensors that was studied by the Norwegian Institute for Air Research in a report authored by Andreas Stohl .
The Norwegian study says the Japanese government estimate came only from data in Japan, and that would have missed emissions blown out to sea. Its says that Fukushima Daiichi radioactive releases equal 40 percent of those from the Chernobyl disaster in 1986.
A study by the French Institute for Radiological Protection and Nuclear Safety also stated that the amount of caesium-137 that flowed into the Pacific from the coastal plant is some 30 times more than was estimated by the plant’s owner, Tokyo Electric Power Co (TEPCO).
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