Hmm... Not sure the difference is quite that extreme. Here a rather excellent chart though, that shows relative exposures from a variety of sources:

http://xkcd.com/radiation/

While perhaps your assertion of the difference between coal fired emissions and those of the damaged reactors isn't quite accurate, according to the link, it DOES show that a whole lot of other exposures that we ignore or take for granted are far stronger. Yup, there's a whole lot of 'hysteriaizin' goin' on!

VARGR