What is the expected range of equilibrium ratios typically found in residential buildings?

The expected range of equilibrium ratios commonly found in residential buildings is indeed between 0.5 to 0.7. This ratio represents the proportion of radon gas concentration in the air relative to the radon concentration in the soil or building materials.

In residential settings, factors such as ventilation, building materials, and soil type influence the radon levels indoors. An equilibrium ratio within this range indicates a significant relationship between indoor and outdoor radon concentrations, suggesting that while radon levels can vary, it is often found in a balanced state due to the factors previously mentioned. This ratio is crucial for radon testing and mitigation strategies, helping professionals assess potential health risks and guide homeowners in managing radon exposure effectively.

Understanding this range allows radon measurement technicians to make informed recommendations regarding radon mitigation systems based on the levels of radon detected in homes.