If radon measurement devices are suspended from the ceiling, how far from the ceiling must they be placed?

Radon measurement devices should be suspended from the ceiling at least one foot away to ensure accurate readings. This distance helps to avoid interference from the ceiling surface which may contain materials that can absorb radon or affect the airflow patterns in the measurement area. Proper placement at this height allows the device to sample air that is representative of the indoor environment, as radon tends to accumulate in the lower levels of a structure and may have variations in concentrations closer to the ceiling due to how air moves within a room. This guideline supports the accuracy and reliability of radon level assessments, which are crucial for making informed decisions about radon mitigation in homes and buildings.