Scattered debris, read a high number of workers radiation dose. The image below has been open to fresh inside the reactor building of the Fukushima Daiichi nuclear power plant.
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Video was taken on October 12th, 2011 when the dust sampling operation was underway at the equipment hatch of the reactor building. http://www.tepco.co.jp/nu/fukushima-np/images/handouts_111022_01-j.pdf