There are also old radon baths in Jachymov in Czech republic working on same principle. Exactly for same primary purpose - problems with joints and bones.
Then communists made local uranium mines/gulags for 'enemies of the state' which was basically a prolonged death sentence, many were just beaten to death or died from cold/starvation.
I'm not clear on what the second paragraph is adding to your example in the first.
It's a related and important historical fact that is not well known outside of Czechia. Why not share it with wider audience when given a chance.
Off topic: I just learned a couple weeks ago that Czechia and Czech Republic are both acceptable names for the country.