9 May 2015. A total of 992 workers, mostly employees at subcontractors, saw their radiation doses top 20 millisieverts in the year that ended in March. The previous year, the number of workers with such high external radiation exposure levels stood at 660, according to the data.

THE JAPAN TIMES

http://www.japantimes.co.jp/news/2015/05/09/national/fukushima-1

At industryabout.com: Fukushima Daiichi Nuclear Power Plant (Shutdown)

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