What percentage of measurements should be field blanks during radon testing?

The requirement for field blanks in radon testing is significant because they serve as a quality control measure to ensure the accuracy and reliability of radon measurements. A field blank is essentially an empty test device that is exposed to the same environmental conditions as measurement devices without actually being exposed to any radon.

The correct percentage for field blanks typically recommended in radon measurement practices is 5%. This means that for every 20 radon detectors used, one of them should be a field blank. The purpose of this is to detect any potential contamination or interference that might affect the overall results of the radon testing process. By incorporating this control measure, practitioners can better ensure that the readings obtained from actual measurements reflect true environmental conditions, free from any external influences that could skew the data.

Maintaining the practice of including 5% field blanks also aligns with standards set by various organizations, reinforcing the credibility of the testing process. This commitment to quality control is essential in ensuring that the reported radon levels are accurate, providing a basis for any necessary mitigative actions if elevated radon levels are detected.