What is the control level for spikes during testing?

The correct answer identifies the control levels for spikes during testing as a 20% warning level and a 30% control level. These levels are established to monitor and assess any temporary fluctuations in radon readings that may occur during a testing period.

A warning level of 20% signifies that if the test results show a spike in radon levels that exceeds this threshold, it could indicate a potential anomaly or the need for further investigation. This serves as an early alert for the tester to verify whether the results are reliable or if any factors, such as environmental changes or testing errors, could be influencing the measurements.

The control level of 30% indicates a more critical point where consistent spikes at or above this level may compel the mitigation specialist to take action. This can involve retesting or employing mitigation strategies if it appears that radon levels are excessively high, posing health risks.

Understanding these thresholds is essential for professionals involved in radon testing, as they guide the decision-making process regarding the validity of test results and the necessary response actions to ensure safety and compliance with regulations.