Owais Crawford
Airport body scanners are a common feature of air travel, and while they may be a source of anxiety for some, they are crucial for ensuring the safety of passengers and preventing dangerous items from being transported onto aircraft. These scanners use advanced imaging technologies, such as millimeter-wave or backscatter X-ray, to detect metallic and non-metallic items, including explosives, that may pose a security threat. While older machines may have revealed passengers' naked bodies, current scanners only show an animated image of where a suspicious item might be located, and cannot detect objects inside the body or under the skin. So, while they may pick up on sweaty feet or unusual items in your hair, they won't literally see under your feet.
| Characteristics | Values |
|---|---|
| Purpose | Detecting threats and preventing dangerous items from being transported onto aircraft |
| Mechanism | Advanced Imaging Technology (AIT) |
| Technology | Millimeter wave scanner, backscatter X-ray scanner |
| Detection | Metallic and non-metallic items, including explosives |
| Privacy | No longer show naked bodies on screen; safeguards for passenger privacy |
| Accuracy | May flag benign items as potential threats, e.g., sweat, skin lesions |
| Alternative | Pat-down screening, which includes an intimate check of sensitive areas |
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What You'll Learn
Airport scanners use Advanced Imaging Technology (AIT)
Airport security systems use various technologies to ensure the safety of passengers and staff. One such technology is Advanced Imaging Technology (AIT), which has been implemented to improve the passenger screening experience. AIT systems have won multiple awards, including the R&D 100 Award in the Software/Services category in 2024.
AIT systems use electromagnetic millimeter waves to detect a wide range of metallic and non-metallic threats, including explosives. The machines send millimeter waves through clothing, and the waves reflect off the passenger's skin and any concealed items. The waves then bounce back an image, which is interpreted by the machine. This process occurs within a matter of seconds.
While AIT systems are designed to protect passenger privacy, older machines using backscatter technology may have displayed naked images of passengers to officers located away from the checkpoint. However, even with these older machines, safeguards were implemented to protect passenger privacy, including having a different officer at the checkpoint from the one viewing the images.
In addition to AIT systems, metal detectors are commonly used in airports. Metal detectors use magnetic fields to identify metal objects. They create a magnetic field by using a brief pulse of electrical current, and any metal objects disrupt the magnetic field, causing the machine to beep and alert the TSA agent.
It is important to note that passengers have the right to opt out of body scanner screening and request an alternative method, such as a pat-down screening. However, it is recommended to remain polite and avoid causing unnecessary tension with TSA agents.
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Scanners detect metallic and non-metallic items
Airport body scanners use Advanced Imaging Technology (AIT) for full-body scans. They can detect a wide range of metallic and non-metallic items, including weapons, explosives, drugs, and other contraband. These scanners use electromagnetic millimeter waves to scan a passenger's insides. The waves pass through clothing and reflect off the passenger's skin and any concealed items, bouncing back an image to be interpreted by the machine.
Millimeter wave scanners emit non-ionizing electromagnetic radiation in the form of radio waves. These waves are reflected off the passenger's body and back to the machine, producing an image that shows the density and composition of materials. This allows security personnel to identify potential threats, such as weapons or explosives, which are often made of metal.
Backscatter X-ray scanners, on the other hand, use low-dose ionizing radiation to detect metallic and non-metallic objects hidden under clothing, in shoes, or even in body cavities. These scanners have been controversial due to concerns about privacy and health risks, with some countries banning their use. However, the amount of radiation received from a backscatter machine is said to be equivalent to the cosmic radiation experienced during two minutes of flight.
Transmission X-ray scanners use higher-dose penetrating radiation to detect objects not only under clothing but also inside the human body or in natural cavities. The dosage of radiation received is typically not higher than 0.25 μSv, which is regulated by American radiation safety standards.
Modern airport scanners are highly advanced and can detect a wide range of threats, including liquid and gel explosives, powder substances, and non-metallic items. They feature rapid processing times, reducing wait times for passengers while maintaining high-security standards.
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Scanners cannot see inside the body
Airport body scanners are designed to detect threats and prevent dangerous items from being transported onto aircraft. They use Advanced Imaging Technology (AIT) to scan for metallic and non-metallic items, including explosives. While these scanners can see under clothing, they cannot see inside the body or detect objects buried under the skin.
The scanners use electromagnetic millimeter waves, which are directed at a passenger's insides. These waves pass through clothing and reflect off the skin and other objects, creating an image that is then interpreted by the machine. This image is not a visual representation of the body; it is an animated image that indicates where a suspicious item might be located.
The technology has been improved to protect passenger privacy, so while older machines may have shown a naked body, this is no longer the case. The privacy safeguards implemented by the TSA mean that the officer at the checkpoint is not the same one who views the scan.
Although the imaging technology is sensitive and can detect potential threats, it cannot see inside the body. This means that airport scanners cannot see under your feet. However, they can detect objects that are concealed under clothing, including sweat, skin lesions, and piercings, which may result in a pat-down from a TSA officer.
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Scanners cannot show you naked
Airport body scanners do not show you naked. While older machines, which are no longer used, could show images of passengers' bodies, newer machines have been improved to protect passengers' privacy, bodily integrity, and physical health.
Today's machines use electromagnetic millimeter waves, which are sent towards a passenger's insides. These waves go through clothing and reflect off the passenger's skin and other objects, creating an image interpreted by the machine. This image is not a detailed rendering of the body but rather an animated image that shows where a suspicious item might be located.
While the machines can detect a wide range of metallic and non-metallic threats, they cannot detect objects inside the body or buried under the skin. The imaging technology is sensitive and can sometimes flag unexpected items and substances as potential threats, such as sweat, cysts, skin lesions, or hair accessories.
If you are uncomfortable with the body scanner, you can opt for a pat-down screening instead. However, this involves a physical check of your body, which may include intimate areas, and is typically done near the checkpoint.
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$14.95
Scanners use electromagnetic millimeter waves
Millimeter wave scanners use non-ionizing electromagnetic radiation, similar to that used by wireless data transmitters, in the extremely high-frequency (EHF) radio band. This technology has been improved over the years to protect passengers' privacy, bodily integrity, and physical health. For example, older machines used backscatter technology, which showed naked images of passengers, whereas newer machines use Advanced Imaging Technology (AIT) and cannot store images of passengers.
The machines send millimeter waves toward a passenger's insides, which go through clothing and reflect off the skin and any concealed items. The waves then bounce back an image, which is interpreted by the machine. This imaging technology is quite sensitive and can sometimes flag unexpected items and substances as potential threats. For example, a 2016 case study revealed that scanning devices can misinterpret cysts and other skin lesions as foreign objects.
Millimeter wave machines are an important part of airport security as they can show hidden threats such as guns and knives. If no threats are detected, the screen turns green and shows an "OK." If an object is detected, it will appear on the screen with a generic body outline to show its location. The TSA may then perform a pat-down to confirm the presence of the object.
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Frequently asked questions
No, airport scanners do not show your naked body. While older machines that are no longer in use could show images of passengers without their clothing, newer machines have been improved to protect passengers' privacy.
Airport scanners use Advanced Imaging Technology (AIT) to detect metallic and non-metallic threats. They can detect objects that are hidden under clothing. However, they cannot detect objects inside the body or under the skin.
Yes, you can refuse to go through an airport body scanner. However, you will have to undergo an alternative form of screening, such as a pat-down, which may include an intimate check of the breasts/groin/buttocks.
