According to NHK, a spike in radiation at the Fukushima Daiichi main gate was reported at Wednesday 10 AM JST, (09:00:00 p.m. Tuesday March 15 ET).
Chief Cabinet Secretary Yukio Edano told reporters on Wednesday the level of radiation near the front gate of the Daiichi plant started to rise around 10:00 AM (09:00:00 p.m. Tuesday ET) and reached a reading of 10 millisieverts per hour at 10:40 AM, but was falling as of 10:54 AM.
He said what appeared to be white smoke was detected near the Number Three reactor at around 8:30 AM, but it's not clear if there's a link between the smoke and the increased radiation.
Edano also revealed that the reading was over 1,000 microsieverts at one time on Tuesday night, and around 600 to 800 microsieverts before it showed a drastic increase. The increase was so high that workers evacuated shortly after 10 am.
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