Robatoy wrote in
:

Interesting:

http://www.nytimes.com/2008/07/24/ga...o_interstitial
=&pagewanted=all

I believe the main radioactive component in granite is a uranium-containing
mineral. Uranium is radioactive, but emits only alpha particles, ie helium
nuclei. Their energy is very low, and will not even penetrate the topmost
layer of skin, which is already dead tissue. It is likely that table salt
is more dangerous.

--
Best regards
Han
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