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I've been told that walking down the salt isle in a grocery store with a geiger counter is enlightening.

There are 'Vapor Caves' in Colorado that I think used to be called 'Radium Vapor Caves', or something like that , when the radon was considered an attribute. I've gone to the caves and enjoyed them....

I think that all stone is radioactive to some degree. My understanding is that the radioactive minerals are ubiquitous and that geological processes sometimes sort and concentrate them into deposits....