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screenshot from http://online.wsj.com/article/SB10001424052748704050204576218661191212684.html#articleTabs%3Dinteractive the state for Mon Apr 25 22:27 confirming that the data about radiation at Sendai are hidden.

About of Mon, 2011 Apr 25 22:00, the data about Sendai were available, and for April 19 the estimate was 59 $\mu$Sv/h, and for April 17 the estimate was 70 $\mu$Sv/h. Such estimates agree with the fit of the data by Mainichi (which suggests roughly 1000mSv/year), confirming that the main source of contamination is not at Fukushima-1 nuclear plant, at least for period 2011 March 14 March 21. Also, such estimates show that Sendai is not a good place for refugees: the radiation at Sendai is 3 orders of magnitude higher than in Tokyo. (For Tokyo, the estimate 0.05 $\mu$Sv/hour is suggested.)

The article suggests the estimate 0.35 $\mu$Sv/hour in vicinity of Sendai for 2011 March 21; which is two orders of magnitude below the estimates above (but still an order of magnitude above the radiation at Tokyo).

The people at Sendai do not believe the government. The government seems to hide the information