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Rn has a half-life of 3.82 days.
The dissapearance of radon concentration, produced at a constant rate, c, is governed by 2 terms, - (lambda1)N - (lambda2)N, where the 1st term is from ventilation and the 2nd from radioactive decay. At large times when the radon concentration is constant, what is the ratio of the radon concentration of the well-sealed house to that of a drafty house.
Well-sealed house loses 1% of air content every hour.
Draft house loses 15% of its air content every 10 minutes.
I calculated the well-sealed house's half life to be 248283 seconds, and the half life for the drafty house to be 2558 seconds. Using the equation N=Noe^-(lambda)t
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