What is the recommended action if simultaneous testing yields one reading of 11.4 pCi/L and another of 5.3 pCi/L?

In the scenario where simultaneous testing results in one reading of 11.4 pCi/L and another of 5.3 pCi/L, the recommended action is to recommend mitigation and investigate sources of error. This choice is based on the understanding that radon levels above 4.0 pCi/L are considered elevated and pose health risks, prompting action. The higher reading of 11.4 pCi/L indicates a significant radon concentration that warrants mitigation efforts to reduce exposure.

Investigating sources of error is crucial as it ensures the accuracy of the testing process. Possible sources of error could include improper placement of testing devices, environmental factors affecting readings, or equipment malfunction. By confirming the validity of both readings and understanding any discrepancies, a technician can ensure that appropriate actions are being taken to address potential radon hazards effectively.

Therefore, selecting the option to recommend mitigation and explore sources of error reflects the best practice in managing radon exposure risks. This proactive approach is essential in safeguarding health while ensuring reliable testing procedures are followed.