What type of results do Passive Devices produce in radon testing?

Passive devices in radon testing are designed to integrate radon concentrations over a specified period, typically several days to a week. When using a passive device, the measurement often reflects a time-weighted average concentration of radon in the air during the testing period. This is due to the device's ability to accumulate radon over time without the need for electronic components or power sources.

This type of result is particularly useful for homeowners or professionals because it provides a representative sample of radon levels that occupants might be exposed to on a typical basis. Unlike devices that produce immediate readings or require adjustments for hourly sampling, passive devices average the concentration over the entire duration of exposure, ensuring a more reliable assessment of radon exposure levels.

However, a time-weighted average does not provide an instant assessment but rather reflects the cumulative exposure, which is essential for understanding long-term radon levels and potential health risks.