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airport

These scanners work in two ways. One type uses nonionizing electromagnetic radiation (millimeter waves), a form of energy similar to that used in radar im­ages and radio signals. This type of radia­tion, which has been used for a century, has no known health effects. The other type of scanner uses "back scatter" ionizing radiation, which exposes an individual to a very weak X-ray signal. The radiation emitted from the scanner is weak enough that the X-ray doesn't penetrate the body.