Exposure to 4 sieverts of radiation would kill 50% of people, according to Japan’s National Institute of Radiological Sciences, per Japan Times. That’s less than 1% of the radiation now being detected inside a damaged reactor at the Fukushima nuclear power station, according to Tokyo Electric Power. The Fukushima operator says it has calculated radiation of 530 sieverts an hour—though with a 30% margin of error—inside the containment vessel of one of three reactors damaged in the 2011 meltdown. Such a level is “unimaginable,” an expert tells Engadget, and hasn’t been seen since the meltdown itself. Since March 2011, the highest radiation recorded has been 73 sieverts per hour.
(Read the rest of the story here…)