In a collocated test where both devices record above the action level, what is the maximum RPD allowed?

In a collocated test where two devices measuring radon levels are used in the same environment, the concept of Relative Percent Difference (RPD) is significant in assessing the accuracy and reliability of the measurements obtained from the devices. When both devices report radon levels that are above the action level, the maximum allowable RPD is defined to ensure that the results are comparable and reliable.

The RPD is calculated to quantify the difference in measurements between the two devices. A maximum RPD of 36% indicates an acceptable range of variability between the readings, acknowledging that variations can occur due to factors such as device calibration, environmental influences, or measurement methods. This threshold helps ensure that while there may be some level of discrepancy, it is within a tolerable limit that maintains the credibility of the radon measurement process.

Adhering to this standard is important for radon measurement professionals, as it provides assurance that both devices function correctly and that the readings obtained are sufficiently consistent to inform necessary actions regarding radon mitigation or further testing.