Roberta Aguirre
Full-body scanners are used in airports to ensure that passengers are not carrying prohibited items on board an aircraft. They were first implemented in the 2000s, but became standard security measures after a Nigerian man on a flight from Amsterdam to Detroit attempted to detonate explosives hidden in his underwear. Full-body scanners use either millimeter-wave technology or X-ray technology to detect objects on or inside a person's body. They can detect both metallic and non-metallic items, including weapons, explosives, and other prohibited items. While they are designed to enhance security, there are concerns about privacy and exposure to radiation.
| Characteristics | Values |
|---|---|
| Purpose | To detect objects on or inside a person's body for security screening purposes, without physically removing clothes or making physical contact. |
| Trigger Objects | Metallic and non-metallic objects, including weapons, explosives, and items in violation of TSA carry-on rules. |
| Specific Examples | Thick hair, hair clips, body piercings, wire supports in undergarments, sweat, layered clothing, zippers, buttons, external tumors, and items in pockets. |
| Technology Used | Millimeter wave scanners, backscatter X-ray scanners, passive infra-red scanners, and Advanced Imaging Technology (AIT). |
| Deployment | Full-body scanners are deployed in various countries, including the US, Canada, Australia, the UK, Italy, the Netherlands, Mexico, Singapore, India, and China. |
| Privacy Concerns | Some countries, such as France and Germany, have banned certain types of scanners due to privacy and health concerns. |
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What You'll Learn
Metal objects on the body
Metal objects on a person's body can trigger an airport full-body scan. This includes metal body piercings, hair clips, wire supports in undergarments, and even sweat, which can set off the scanner due to how the waves bounce off water.
Full-body scanners use Advanced Imaging Technology (AIT) to detect a wide range of metallic and non-metallic threat items in seconds. They send millimeter waves through a person's clothing, which reflect off their skin and any concealed items, creating an image that is interpreted by the machine. This technology is more effective than metal detectors as it can identify items made from non-metallic materials, such as plastic explosives, that may not be detected by standard metal detectors.
The use of full-body scanners at airports became more widespread in the 2000s, particularly after a 2009 incident where a passenger smuggled plastic explosives in his underwear onto a flight to Detroit. This event prompted the Transportation Security Administration (TSA) to deploy full-body scanners in American airports.
While these scanners have raised concerns about privacy and radiation exposure, they are generally considered safe. The radiation exposure from a single scan is equivalent to around 1-3 minutes of flight time, resulting in a very small increase in overall radiation exposure for air travellers.
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Non-metal objects on the body
Full-body scanners at airports can detect non-metal objects on or inside a person's body. This became an increasing concern after various airliner bombing attempts in the 2000s, such as the 2009 incident where a passenger smuggled plastic explosives in his underwear on a Detroit-bound flight.
There are two types of full-body scanners in use: millimeter wave scanners and backscatter X-ray scanners. Millimeter wave scanners use non-ionizing electromagnetic radiation in the form of millimeter waves, which are reflected off the body and back to the machine. These waves are similar to those used by wireless data transmitters and are a lower frequency than visible light. They can detect non-metal objects, including those inside the body, such as drugs in the stomach. Passive infra-red scanners are another type of technology that can detect non-metallic objects without using an external radiation source.
Backscatter X-ray scanners use low-dose radiation to detect metallic and non-metallic objects hidden under clothing, in shoes, or in body cavities. The dosage of radiation received is typically between 0.05 and 0.1 μSv, which is equivalent to around 1-3 minutes of flight time. While there have been concerns about the safety of these scanners, the radiation exposure is minimal compared to other sources of radiation, such as dental X-rays or medical imaging.
Some unusual things that can trigger a full-body scanner include thick hair, especially in braids or buns, hair clips, underwire bras, and sweat. These triggers are due to the way the millimeter waves bounce off water or thick objects.
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Thick hair
The body scanners used at airport security checkpoints are designed to detect both metallic and non-metallic threat items, such as weapons or explosive materials. These machines use Advanced Imaging Technology (AIT) and millimeter-wave imaging to create an image of a person's body and reflect whatever is concealed underneath their clothing.
While these scanners are effective in detecting potential threats, they have also been criticised for being prone to false alarms triggered by certain hairstyles. This has raised concerns about potential discrimination and the invasiveness of hair pat-downs. In response, the TSA has stated that it is reviewing additional options for screening hair and ensuring compliance with the Civil Rights Act.
It is important to note that the radiation exposure from these scans is minimal and equivalent to a small fraction of the energy of a cell phone. Additionally, the doses of radiation from airport scans are significantly lower than those used in medical imaging procedures.
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Underwire bras
Full-body scanners were first implemented at airports in the 2000s, but they became standard security measures after a failed terrorist attack on a flight from Amsterdam to Detroit. The scanners use millimeter wave imaging, which uses electromagnetic radiation to detect metallic and non-metallic threat items.
Some women have reported having to undergo pat-downs due to the underwire in their bras setting off the full-body scanners. This can be an uncomfortable and embarrassing experience, especially for those with larger busts who may require more support. To avoid this issue, some travellers recommend wearing a wire-free bra or sports bra through airport security, especially when travelling in Europe.
However, other readers have reported wearing underwire bras through security without any issues. Ultimately, the decision to wear an underwire bra through airport security is a personal choice. Some factors to consider include the level of support needed, the potential for additional screening, and personal comfort and preference.
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Sweat
Malvini Redden goes on to explain that these machines often generate false alarms, which has led to them being banned in some countries, including France and Germany. In addition to sweat, other seemingly innocuous things can also trigger the scanners, such as layered clothing, zippers, buttons, and certain hairstyles like braids, dreadlocks, and buns.
While it may be surprising that something as harmless as sweat can set off an airport full-body scanner, it is important to note that these machines are primarily designed to detect "metallic and non-metallic threat items", such as weapons and explosive materials. The use of millimeter wave technology allows the scanners to identify items that standard metal detectors may miss, such as non-metallic weapons or explosives hidden under clothing.
Despite the effectiveness of full-body scanners in enhancing airport security, there have been concerns raised about the potential health risks associated with the radiation exposure from these scanners. While the dose of radiation from airport X-ray scanners is considered very low, there is a lingering question about whether it is harmless. Critics argue that the mechanical beam's intensity level has not been published, making it challenging to evaluate the safety claims. Additionally, the concentration of radiation on the skin raises questions about possible health implications.
In conclusion, while sweat can trigger a full-body scan at airport security due to the nature of millimeter wave technology, it is important to understand the broader context of these security measures and their potential trade-offs between safety and privacy.
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Frequently asked questions
Full-body scanners at the airport are looking for weapons, explosives, or other prohibited items that might be concealed under clothing. They are designed to detect both metallic and non-metallic items.
Full-body scanners can be triggered by metal objects on the body, such as piercings, hair clips, or braids and dreadlocks due to their thickness. External tumors can also trigger the scan, but internal growths like fibroids will not. Additionally, sweat can set off the scanners due to the way millimeter wave technology interacts with water.
Full-body scanners use millimeter wave technology or backscatter X-ray scans to detect objects on or inside a person's body. Millimeter wave scanners emit low-level millimeter-wave, radio-frequency (RF) energy, which bounces off the person's skin and any concealed objects, creating an image that is interpreted by the machine. X-ray scanners emit low levels of X-rays, a form of electromagnetic ionizing radiation.
