How does the allowable power density for RF safety change if duty cycle changes from 100 percent to 50 percent?

RF exposure limits are calculated based on the average power emitted over a specific time period. The duty cycle represents the percentage of time a transmitter is actively producing RF energy. If you reduce the duty cycle from 100 percent (continuous transmission) to 50 percent (transmitting half the time), the average power emitted over time is cut in half. Because the human body is only absorbing energy for half the time, you can safely double the peak power density during the "on" time while still maintaining the same overall average exposure. Therefore, the allowable peak power density increases by a factor of 2.