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17 crew members were exposed to low level activity in the mission and the radio activity was removed from the affected crew by washing with soap and water and no further contamination was detected so far. >> so what is a nuclear melt down in what is the base of a nuclear power plant. they were built 40 years ago by general electric. >> that's right. >> this is how it takes place. the nuclear scientist, it is too simple for me. but this is how it works . >> it has fuel rods and there is a nuclear reaction if creates electricity from the rod. it has to be hot . it was hot when the tsunami and ea...

This is the scene at one shelter in sendai, japan where victims are still coping with their losses after the earthquake and tsunami devastated this region. at least 160 people living near japan's troubled power plant have been exposed to high levels of radiation and after new cooling problems just today, more radioactive steam will have to be released. senior medical correspondent elizabeth cohen has been following developments for us. how much do we know about the kind of radiation that these people are being exposed to? >> there's a lot that we don't know. and i'm glad you asked about the ...

Iodine. there is radio activity from nitrogen and some from two very mild isotopes. the existing natures and the other ones are in small concentrations coming out. there is a small amount of particulate and not a significant release and not a large release. >> is there any danger that any of this release is radiation that could travel and the whether could be downwind to folks in the united states, hawaii, guam and reach the west coast at some point? >> it certainly could travel a significant distance and the more it travels, the more it disberss. we started with a small radioactive release an...

>> the problem with wind and solar, linda, is can we do it in scale to meet all of our needs? i think the answer is no. i was a huge proponent of wind and solar in pennsylvania. linda, i'd like to ask you one question for our viewers to keep it in context. what was the level of radiation release in three mile island? >> that's a good question that no one really has the answer because the measurement, the devices that were measuring the radio activity that was released from three mile island, the levels went off the scale and they shut them down. that is probably something we will never know. b...

Radioactive material. we're 48 hours past the point where the nuclear fission stopped here. a lot of vet worst of the radio activity will have died away. we're self-day s away from safety. but i believe the response has been proportion it's proportion it's a and efficient. >> how long to get the levels back to where it's deemed safe? >> it depends how efficient at getting the sea water into the nidle of the plant. my understanding of reactor number one. they decided they weren't going to try and save the plant for future electricity use. at that point, they can afford to take things that would...