What does “time averaging” mean when evaluating RF radiation exposure?

In the context of RF radiation safety, "time averaging" refers to the total RF exposure averaged over a specific regulatory period. Because the primary biological effect of RF exposure at amateur frequencies is tissue heating, the body can dissipate this heat over time. Therefore, limits are based on average exposure rather than instantaneous peak power. The FCC specifies specific time intervals for these averages: typically 6 minutes for "controlled" (occupational/operator) environments and 30 minutes for "uncontrolled" (general public) environments. This means you can transmit at a higher power level for a short time, provided your average power over that 6- or 30-minute window remains below the limit. Distractors such as a 24-hour period are incorrect because the body's thermal response happens much faster than a full day, requiring much shorter averaging intervals for safety.