What is the implication of having a detector in a draft of moving air?

Having a detector in a draft of moving air can distort the test results. This is primarily because the presence of draft can interfere with the accumulation of radon gas around the detector. Radon detection typically relies on the measurement of radon gas in a stable environment where the concentration can be accurately assessed over a specified period.

When air is in motion, it can lead to fluctuations in radon levels near the detector, resulting in inaccurate readings. This can happen either by diluting the concentration of radon that the detector would otherwise measure or by causing fluctuations that do not represent the ambient radon levels in the space. Therefore, ensuring that the detector is placed in a location with minimal airflow is crucial for obtaining reliable radon measurements.