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Cannons as opposed to the helicopter drops. that means putting more personnel in harm's way. the u.s. military helped a japanese crew to learn how to use two water cannons the military had. they have donated those. but it is very difficult. they are trying to pour -- literally pour water on top of these fuel rods to get them covered to cool them down. but at great personal risk to themselves. i want to bring in dr. sanjay gupta. what is the greatest risk for people in the outlying areas? >> well, the greatest risk is that these radiation levels we've been talking about start to go up. you try ...

States, fairfax, virginia and los angeles, people are shuttled in shelters that don't have electricity and heat, sit a very difficult situation, and the focus, because there's so much understandable focus on this nuclear catastrophe, the situation up north, they're not paying as much attention to it as they are right now to the nuclear issue. on the nuclear front, a lot of what happens over the next 12 to 24 hours, and how many people are affected by it, will depend on what way the wind is blowing. that's what it comes down to. the united states has deployed a radiation detecting plane which i...

Company and government officials are stationed there. >> it seems like the information that the united states government has, that they said today in testimony before congress saying that spent fuel rods are completely exposed in one of the reactors and that there is no water covering them, that information has not been stated by the japanese government. why is that? >> well, it's a bit difficult for me to explain the perspective of the u.s. official. but let me just tell you that two hours ago, there was a telephone conversation between president obama and prime minister kan. and they discuss...

Part, we're not detecting radioactivity. you want to know how much exposure have you had. >> a machine doesn't tell you how much exposure you've had three days ago? >> no. think of it like a camera. you can hear it clicking off as it's giving readings here, which are all low. they're significantly low as compared to anything that would trigger an alarm. that measures alpha, beta and gamma rays. this is just measuring the air constantly around us, 13 microrads per hour, and that's, again, a very low number. >> professor, how does radiation spread over distance? if you are -- the u.s. government...

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