An older home was built in an area that has a high radon, Ask an Expert

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An older home was built in an area that has a high radon flux (10 pCi/m2-s). The concrete slab did not have a plastic vapor barrier installed, so assume that 85% of the radon passes through the slab and into the house. The house has a slab area of 2,400 ft2, an enclosed volume of 24,000 ft3 and averages 1.2 ach (air changes per hour). The half-life of radon is 3.82 days. Assuming the ambient concentration is negligible, estimate the steady-state indoor radar concentration.

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