Consider a house into which radon is emitted through cracks in the basement. The

Question

Consider a house into which radon is emitted through cracks in the basement. The total volume of the house is 650 m3 (assume the volume is well mixed throughout). The radon source emits 250 pCi/s. (A pico Curie [pCi]) is a unit proportional to the amount of radon gas and indicates the amount of radioactivity of the gas.) Air inflow and outflow can be modeled as a flow of clean air into the house of 722 m3/hr and an equal air flow out. Radon can be considered conservative in this problem. What is the retention time of the house? What is the steady-state concentration of radon in the house (units of pCi/L)?

Explanation / Answer

steady state conc =250/650=.39pCi/s-m^3

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