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acoustic energy antenna appendix applications Army attenuation average power averaged scanning power biological effects biological system cardiac pacemaker dB 22 dB Decibels demand type Denied Occupancy Area diathermy unit distance door duty cycle elec electric field Electromagnetic Compatibility electromagnetic energy electronic equipment Exponential Systems exposed exposure of personnel factor field region field strength frequency gigahertz guidelines H field hazard evaluation hertz HPBW interference interlocks Isotropic Antenna joule LIMITED OCCUPANCY AREA maintenance malfunction maximum measurement megahertz Microwave Cooking microwave diathermy microwave energy microwave or RF microwave oven microwave radiation normal operating output personnel hazard physical therapy potentially hazardous power density level POWER POWER POWER Power Ratio probe propagation propagation modes Pulse Repetition Frequency quency radar RF and microwave rotation scanning power density shielding SOPs tion tissue transmitting trasound tromagnetic tubes ultrasonic Ultrasound energy USAEHA visual inspection warning signs wave wavelength x-rays