For uncontrolled RF environments, over what period is MPE averaged?

In uncontrolled RF environments, the Maximum Permissible Exposure (MPE) is averaged over a period of 30 minutes. This time frame is established to account for fluctuating levels of RF exposure that might occur in such environments, ensuring that the average exposure does not exceed safety limits defined by regulatory standards.

The rationale behind the 30-minute averaging period is tied to human factors and safety. It allows for a more realistic assessment of exposure over a typical duration that someone might be in an uncontrolled RF environment, such as in public areas or workplaces. This averaging helps to mitigate the risks associated with transient spikes in RF exposure, thus promoting safety for individuals who may encounter varying levels of RF energy in their surroundings.

Other time frames, such as 6 minutes, 15 minutes, or 60 minutes, are not aligned with the standards set for uncontrolled environments, which specify the 30-minute period as the appropriate duration for averaging. This specification reflects the need to establish a balanced approach to public health and safety while allowing for some variability in exposure levels.