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Find a Nature images full hd images for your creative needs, desktop wallpaper or Android device. A full-body scanner is a device that detects objects on a person's body for security screening purposes, without physically removing clothes or making physical contact. Depending on the technology used, the operator may see an alternate-wavelength image of the person's naked body, or merely a cartoon-like representation of the person with an indicator showing where any suspicious items were detected. For privacy and security reasons, the display is generally not visible to other passengers, and in some cases is located in a separate room where the operator cannot see the face of the person being screened. Unlike metal detectors, full-body scanners can detect non-metal objects, which became an increasing concern after various airliner bombing attempts in the 2000s. Starting in 2007, full-body scanners started supplementing metal detectors at airports and train stations in many countries. Three distinct technologies have been used, though the use of Backscatter X-ray has now been discontinue in many countries: Millimeter wave scanners use non-ionizing electromagnetic radiation similar to that used by wireless data transmitters, in the Extremely High Frequency (EHF) radio band (which is a lower frequency than visible light). The health risks posed by these machines are still being studied, and the evidence is mixed, though millimeter wave scanners do not generate ionizing radiation. Backscatter X-ray machines use low dose penetrating radiation for detecting suspicious metallic and non-metallic objects hidden under clothing or in shoes and in the cavities of the human body. There has been considerable debate with regard to how safe this technology is. Through-body X-Ray security scanners that emit a high level of radiation have been supplied by the US to at least two African countries. Passengers and advocates have objected to images of their naked bodies being displayed to screening agents or recorded by the government. Critics have called the imaging virtual strip se ...
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