It's been confirmed fake on various sites. Not to mention if it were real, almost half the country would be killed. That is the type of thing that would be reported. 750 RADs is beyond lethal.
That specific map might be however it's fairly accurate, especially with the developments in the past 3 hours or so. That's exactly how the winds are going to bring the crap over that they keep venting into the atmosphere, not to mention that in a few hours it'll probably be a full melt down on at least 2 of the reactors... the leak at Chernobyl was detected HOURS later at the radiation detectors at Forsmark Nuclear Power Plant in Sweden and at first they thought THEY had a leak.
Yeah, I really wish they'd get this mess under control... radiation levels are 8x what they should be outside the reactors, 1000x inside, and they keep venting radioactive gas. I'm still trying to figure out why they built 50-something nuclear facilities on the ring of fire...