Abstract
Most shortwave therapy apparatus uses electromagnetic radiation at a frequency of 27.12 MHz (11 metres). This frequency is near to that used for CB radio communication and this fact, perhaps, indicates the difficulty of containing the radiation to a specific region of space, or tissue. The power output of the equipment should not be more than 500 watts and is considerably less than this under normal operating conditions. Some manufacturers provide equipment operating at 434.92 MHz although this is relatively uncommon and should be classified as microwave equipment. The radiation can be either continuous or in the form of pulses. Pulsed mode operation is the subject of a separate document.
Published Version
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