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" How does scanner work ? "
55555 ยายว่า ม่ะช่าย " ตู้ ไมโครเวฟ " น๊าาา อ่ะ ฮา 5555
http://www.radiologyinfo.org/en/safety/index.cfm?pg=sfty-airport-scannersTypes of airport scannersThe two types of scanners typically used in airports
include millimeter radio-wave and backscatter scanners.
Millimeter radio-wave scanners use millimeter radio waves similar to those generated by cellphones.
This type of scanner does not use x-rays.The second type, backscatter scanner, uses low intensity x-rays.
How does a millimeter radio-wave scanner work?A millimeter radio-wave scanner stands out at airports because of its design
that includes a booth where people stand with their arms raised.
Inside the booth, the person is scanned with millimeter radio waves.
Antennas then collect the reflected waves to generate images.
Because this type of scanner does not use x-rays,
but instead uses millimeter radio waves similar to radio waves produced in a cell phone,
there should not be concern about the effects of radiation from this scanner.
How does a backscatter scanner work?
Backscatter scanners also stand out in airports because of their design,
which includes two large boxes for individuals to stand between with their arms raised.
Inside the backscatter scanner is an x-ray source that produces low intensity x-rays.
The scanner uses a low intensity narrow x-ray beam to scan people at high speed
and in a raster pattern. The scan typically takes between two to five seconds.
The large detectors capture the backscatter x-rays to create images within a few seconds.
This method is useful for detecting objects hidden under clothes or taped to the skin surface.
