Radon testing involves two primary methods. One popular method uses activated charcoal test kits. These tests collect radon gas atoms. A lab receives these devices and counts the radon results. Another test uses an electret with a plastic disc and static charge. Radon professionals are more likely to use these tests because of the expertise required to read them.
Another way to test for radon is through active devices. These devices may be continuous radon monitors or CRMs. Most radon inspectors will use this device for a short-term radon test when you purchase a home. While you can find many different models, you do need experience to use one.