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Is, you know, you have the roof blown off and that exposes the fuel but generally i guess the expectation is that you can keep filling up that pond with water, generally there is about at least 30 feet of water above those fuel rods and all of that acts as radiation shielding and cooling and the problem is as that water goes down, you're going to have a range of radiation risks and if there is a fire, you won't only get those gases, you'll have particulate matter and that's a very serious situation indeed. >> mr. gundersen, i want to try the best we can with the information we have to get this...

News, japanese officials saying workers at the plants are unable to continue operations due to radiation risks. i'm here with dr. sanjay gupta and also from m.i.t. jim walsh. jim, again, if this is the final 50 workers who were the only workers left at the fukushima daiichi plant after several hundred had been evacuated days ago, this is extraordinarily alarming news. >> well, it means two things. it means that it is a highly, highly radioactive area, and they're withdrawing the 50 people because it's gotten so bad. and secondly, it means there's no one to mind the store. there's no one to kee...

So, again, the breaking news, japanese officials saying workers at the plants are unable to continue operations due to radiation risks. i'm here with dr. sanjay gupta and jim walsh. jim, again, if this is the final 50 workers who were the only workers left at the fukushima daiichi plant after several hundred had been evacuated days ago, this is extraordinarily alarming news. >> well, it means two things. it means that it is a highly, highly radioactive area, and they're withdrawing the 50 people because it's gotten so bad. and secondly, it means there's no one to mind the store. there's no one...

Radioactive steam burst from another. it prompted remaining workers to be yanked and more residents to flee the area. >> if the fuel rods are exposed the radiation material inside the container could seep out. >> it's also causing the people of tokyo 140 miles away to get very nervous. >> this is tokyo and normally the sidewalk would be packed with people but fears over possible nuclear catastrophe are keeping a lot of people off the streets. >> snarled with traffic looked like a sunday. warnings by the government to stay inside due to radiation risks are being heeded. "i am worried about my h...

Boron into these spent fuel ponds at the same time they're trying to get water that would cool it. i think the spent fuel ponds are the most urgent. but we've been surprised, and so you have to worry, have containments been breached in two of the reactors? will more radioactive contamination come out? will there be a meltdown? there's a lot to worry about, unfortunately. >> there is a lot to worry about. and what does it tell you that they had to briefly evacuate the 50 workers who were there, that the efforts to dump more water on, they had to pull back those choppers because of concerns abou...