What action can best prevent interference in radon testing?

Using interference-detecting techniques is the most effective way to prevent interference in radon testing. These techniques allow for the identification of any factors that may confuse or skew the radon measurements, ensuring a more accurate assessment. For instance, certain environmental conditions or the presence of other gases may affect radon detection. By employing technology or methods designed to detect these interferences, a tester can confirm that the readings reflect only radon levels, which is crucial for reliability and safety in radon measurement.

Delaying tests may appear beneficial but does not actively address the risk of interference once testing begins. Not informing clients could lead to misunderstandings about the testing conditions and the integrity of the results. Testing without monitors provides no data whatsoever about radon levels, and therefore, it is not a practical strategy to ensure accurate measurements. Thus, using interference-detecting techniques significantly enhances the integrity and reliability of radon testing.