Body scanners typically work by using low-level radio waves to create an image of a person.
Most commonly, these units utilize millimeter-wave technology. This technology employs non-ionizing radiation in the form of low-level radio waves to scan a person's body. Unlike X-rays, which use ionizing radiation, millimeter waves are considered safe and do not penetrate the body.
The Millimeter-Wave Scanning Process
Millimeter-wave body scanners operate by sending harmless radio waves over the person standing inside the machine. Here's a breakdown of the process:
- Standing Position: A person stands in a designated area within the scanner.
- Antenna Rotation: A millimeter-wave body scanner uses two antennas that rotate around a person's body. These antennas emit and receive the radio waves.
- Wave Interaction: The radio waves interact with the body and any objects hidden on the person. Different materials reflect or block the waves differently.
- Signal Reception: The antennas capture the reflected or transmitted waves.
- Image Creation: A computer processes the received signals to create a digital image or a generic outline of the person's body. Objects concealed under clothing appear on this image.
What Do Body Scanners Detect?
Body scanners are designed to detect metallic and non-metallic items hidden under clothing. This can include:
- Weapons (guns, knives)
- Explosives
- Contraband (drugs, currency)
- Other prohibited items
Where Are Body Scanners Used?
Body scanners are commonly deployed in locations requiring high levels of security screening:
- Airports
- Courthouses
- Prisons
- Government buildings
By using millimeter-wave technology, these scanners provide a non-intrusive way to enhance security by identifying potential threats or prohibited items without physical contact.
