Consider a house into which radon is emitted through cracks in the basement. The total volume of the house is 650 m^3 (assume the volume is well mixed throughout). The radon source emits 250 pCi/s. (A picoCurie [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 m^3/h and equal airflow out. Radon can be considered conservative in this problem.

1. What is the retention time of the house?
2. What is the steady-state concentration of radon in the house (units of pCi/L)?

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