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Radon - Wikipedia, the free encyclopedia
Its most stable isotope, 222Rn, has a half-life of 3.8 days.
Which means that ventilation mixes it with the broader atmosphere and reduces the exposure from being near granite.

Economics is politics by other means
by Carrie (migeru at eurotrib dot com) on Fri Apr 1st, 2011 at 05:53:55 AM EST
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