temperatures way beyond what the normal operating parameters are in anticipation that these issues might some day arrive, as they have. you notice, there was no breach of containment, there was no interruption of the reactor vessel itself. so the main goal here is to make sure that that seawater covered that feuel. >> professor, in lay men's terms here for the folks who are watching, i'm not an expert when it comes to nuclear power, radiation or what have you. you said last night, in your estimation, if you go and get an x-ray or certain procedure at the doctor, that most of us are exposed to higher levels of radiation than have already leaked, according to reports. so what is the concern there? what's the exposure for people