Discussion
Radon in a house is \( 200 \ \mathrm{Bq/m^3} \) and the entry rate is unchanged. Doubling the ventilation rate brings the concentration to approximately
Answer: D
With a fixed source the steady concentration is inversely proportional to the ventilation rate. In practice increasing ventilation can also increase the pressure difference that draws radon in, so the gain is often less than the simple calculation promises.
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