"Interestingly, more radiation can be released from NORM in buring coal than from a leaky nuke reactor."
What's NORM?
Naturally Occurring Radioactive Material
I deal with it all day long in the oil business --- lots of strata underground are unhealthily radioactive, and mining drilling can be cause some serious surprises, especially if enclosed (radon) etc.
Coal has a fair number of carbon and other isotopes in it that are released when burned.
Modern scrubbers catch 99 44/100% though, so it really is not a big concern, assumig a dumb arse isn't running the show.