Suppose the soil under a single-story house emits 1.0 pci/m2 -s of radon gas. all of this gas finds its way through the floor and into the house. the house has 250 m2 of floor space, an average ceiling height of 2.6 m, and an air change rate of 0.9 ach (air change per hour). estimate the steady-state concentration of radon in the house, assuming the ambient radon concentration is negligible. radon decay is a first-order reaction and its half-life is 3.8 days. 1 pci stands for picocurrie which is a radon measurement unit.
