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Spread over distance? the obama administration has come forward and said americans should be no closer than 50 miles to this nuclear plant. that is a greater distance than the japanese government has been using the last several days. does 50 miles make sense to you and how does radiation spread over farther distances? >> the radioactivity is actually tached to dust particles and it is the movement of the dust particles that tell you how the radioactivity moves. again, as you were eluding to earlier in the show it is the wind. the two big factors that will control what happens is how much radio...

And releasing radiation from that area. anderson, i will say something about these helicopter drops that have been going on. as we have looked at this, we talked about the fear of explosive radiation beyond this, if you look at t what was happening, we talked starting yesterday. jim and i were talking about how radiation from this, if it is uncovered, could be fatal from 50 to 100 yards. i was looking at those helicopters earlier, anderson and i was doing estimates based on the fusage language, about 60 -- fuselage, about 60 feet. they were easily flying somewhere between 60 and 100 yards abov...

Anywhere near here and you can't do anything about it, frankly nobody really knows what will happen, especially in one like number three, where they have uranium and plutonium. some people are talking about temperatures in the bottom of the kald ron of this thing pushing 10,000 degree and they have no idea what that will do to the sir cone yum and everything they are making it up right now. >> in terms of making it up, we are trying to verify as much information as we can on what is happening on site. all of the information is being filtered through this private company who has a track record ...

There's a lot happening and he's prepared for the possibility of radiation exposure. his family is supporting him. we accept things to one extent and want him to do his best. there was an e-mail reply and the content was rather intense. live fully. i will not be able to come back for a while is what it said. >> i can only imagine what it is like for those workers. we will talk about that to dr. sanjay gupta. you actually have some equipment here. we understand the workers are wearing suits similar to this. some may have breathing devices. >> that's right. >> there are were 50 workers. and now ...

In terms of, a it is a discussion we are having and everyone in tokyo is having and anyone near the plants is having is where is it safe? a lot of it depends on wind conditions, but is this an answers to that question? >> part of it depends how you define "safe." >> let's establish -- when you say something like that it is never good. >> give you an example. if you were to smoke a pack of cigarettes, it is not good. is it going to kill you, probably not just one pack of cigarettes. it is not safe but in that low dose it is probably not a problem and that's the issue when you go back and forth ...