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Tuesday, Japanese authorities provisionally declared the country’s nuclear accident a level 7 on the international scale for nuclear disasters. A 7 is the highest level.
Though the rating puts Japan‘s disaster at the same level as the Chernobyl disaster, about 7 times as much radioactive cesium was released at Chernobyl.
The number had previously been at a 5.
Regulators determined the amount of radioactive iodine released by the Fukushima Daiichi reactors was at least 15 times that needed to reach the top of the International Nuclear Event Scale.
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