Because these devices are not integrating devices, the result may not reflect the true average for the sample period and further testing may be required. The EPA now requires EPA RMP on site testing firms to place two of these devices in the same area either sequentially or concurrently. Results from these devices can vary widely depending upon whether EPA protocols were followed in the handling of the device and the quality control of the manufacturer. On Site Air Monitors Because of their precision, these devices can be made relatively tamper free and are the best course of action when large amounts of money are involved, such as a real estate transaction. A Radon specialist utilizes a computer and a device called a continuous working level monitor to measure Radon decay products.
Results are available immediately at the conclusion of the test.
There are firms that use continuous Radon monitors. These monitors do not measure Radon decay products, the true health concern. Be sure that the monitor being used integrates or reads minimally every hour. This will allow you to see any dramatic changes that occurred during the test such as a window being opened. Many people do not know that Radon coming from deep wells can be a health problem because of aeration or ingestion.