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Not a beg dose, but it is out there and people have few options to get out of here. >> nbcs lester holt, thanks for your report tonight, lester. >> reporter: you bet. >> for more on the nuclear worries surrounding this disaster, we turn to dr. edwin lymon. what do you make of the notion that there is a 12-mile radiation zone risk? is that an adequate zone to be outside of in order to protect yourself? >> i have never believed that an evacuation zone limited to 10 miles or 12 miles would be adequ...