What is the Equilibrium Equivalent Radon?
Equilibrium Equivalent Radon, or EER, is the amount of radon gas that would be needed to create the amount of radon decay products that were measured, assuming 50% of the decay products created are in the air. Converting radon decay product measurements from Working Levels (WL) to an equivalent amount of radon gas is a convenient way to compare the radon decay product measurements to the sometimes more familiar EPA guidance of radon which is 4.0 pCi/L. The radon decay product measurement can be compared to the EPA guidance of 0.02WL or this measurement calculated in terms of EER can be compared to the EPA Guidance of 4.0 pCi/L.
