Japanese authorities Tuesday "provisionally" declared the country's nuclear accident a level-7 event on the international scale for nuclear disasters -- the highest level -- putting it on par with the 1986 Chernobyl disaster.
Japan's Nuclear and Industrial Safety Agency announced the new level Tuesday morning. It had previously been at 5.
Regulators have determined the amount of radioactive iodine released by the damaged reactors at the Fukushima Daiichi nuclear plant was at least 15 times the volume needed to reach the top of the International Nuclear Event Scale, the agency said. That figure is still about 10 percent of the amount released at Chernobyl, they said.
The amount of radioactive Cesium-137, which has a half-life of 30 years, is about one-seventh the amount released at Chernobyl, according to the agency. Read More
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