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If I remember right, it's a decay product of uranium naturally present in soil.
I have a instrument that continuously monitors the Radon level in the lower level of my home. When it rose to 6 pC/L I had a system...
Yes; I did a bunch of overseas medical missions - Technical Support and unofficial mission DB administrator. They do prefer US doctors...
Returned from about a week away from all this, only to find that no one has posted any actuarial tables (here is one among many):...
