The MPE in milliwatts per square centimeter equals the frequency in megahertz divided by 1500 averaged over any 30 minutes 

The MPE in milliwatts per square centimeter equals the frequency in megahertz divided by 300 averaged over any 6 minutes

There is no formula, MPE is a fixed power density of 0.2 milliwatt per square centimeter averaged over any 30 minutes

There is no formula, MPE is a fixed power density of 1.0 milliwatt per square centimeter averaged over any 6 minutes

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