Utilize safe work practices during maintenance. Calculate safe distances and required Optical Density of goggles. Current research is investigating synergistic effects, including cancer promotion. Exposures are averaged over a 6 minute period. Deep body heating reduces the effectiveness of pain as a warning mechanism.
Heat is only perceptible at very high exposures.
These sources were known to be potentially hazardous, so they are controlled . Therefore, intense exposures are typically a result of accident or equipment failure . Many of these sources are not controlled since RF frequencies were not thought to be hazardous. Therefore, more intense exposures occur and far greater number of workers are exposed to excessive RF rather than microwave radiation. The standards allow for spacial averaging.