reactor core and goes into pools that fuel also needs to be kept cool. it's not as volatile as the fuel. >> bill: it's possible that a terrorist attack or intrusion nature could have somewhat the effect. >> it's certainly not impossible. something we need to worry about. >> bill: doctor, have you been studying the chernobyl victims. we hear these 17 servicemen low level radiation is there any such thing as low level. >> ininvisible. you breathe it in with contaminated air and water. if we have learned one thing from chernobyl there is a lot more to learn. >> they are deemphasizing, authorities saying no danger to these folks scrubbed it off this, that, and the other thing. you are not buying that. >> i will give them the benefit of the doubt. if i was a service man, i would get a check up with my doctor at home. >> even that's impossible. look what happened with 9/11 with breathing in that debris and then it comes 7, 8 years later where they have all kinds of health problems that's what you are seeing at chernobyl it took a long time for the health problems to develop in some