On Friday, March 18 17:36 JST (04:36 am Friday March 18) NHK reported that TEPCO reported radiation measurements about 500 meters northwest of the Fukushima Daiichi plant on Friday Mar 18 JST afternoon.
- 1:50 PM 3,484 μSv/hr
- 2:50 PM 3,339 μSv/hr
For a nuclear energy worker 15 hours of exposure to this level of radiation is equivalent to the annual permissable exposure of 50 mSv.

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