What equipment is commonly used to screen personnel for unauthorized metal objects?

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The equipment commonly used to screen personnel for unauthorized metal objects is the magnetometer. This device operates by detecting variations in magnetic fields caused by metallic objects on a person. When someone walks through a magnetometer, it emits a magnetic field and if metal is present, it will trigger an alarm. This makes it highly effective for security screening in places such as airports, government buildings, and large events, where detecting metal weapons or contraband is a priority.

Other options like X-ray machines and body scanners are typically used for scanning baggage or larger items rather than for personnel screening in a direct manner. Security wands are handheld devices that can also detect metal, but they are generally used for secondary screening after a magnetometer alarm has been triggered. Thus, the magnetometer is specifically designed for the primary screening of individuals entering secure areas.