Which of the following is used to determine RF exposure from a transmitted signal?

Evaluating RF exposure requires analyzing several specific factors. Power density, which is the strength of the RF field at a given distance, is the primary measure of how much energy is present and capable of causing heating. The frequency of the signal is critical because the human body absorbs RF energy more efficiently at certain frequencies (particularly in the VHF range around 30 to 300 MHz). Finally, the duty cycle accounts for the percentage of time the transmitter is actually emitting a signal, as tissue heating effects are based on the average power over time.