This standard applies to security screening systems that utilize x-ray or gamma radiation and are used to inspect people who are not inside vehicles, containers, or enclosures. Specifically, this standard applies to systems used to detect objects carried on or within the body of the individual being exposed. The following types of systems are included in the scope of this standard: - Systems designated as fixed, portal, re-locatable, transportable, mobile or gantry. - Systems employing detection of primary radiation (transmission systems) or scatter radiation (backscatter systems) or a combination of both. - Systems that are primarily imaging but