Ruth Haines
Airport scanners are an essential security feature that helps detect and eliminate prohibited items and substances that are not allowed on planes. These scanners use advanced X-ray technology to penetrate objects and create detailed images, allowing security officers to identify items based on their density and atomic number. While these scanners are highly effective in spotting metallic objects like knives and guns, they can also detect non-metallic objects and organic materials. However, certain dense and thick metals, such as gold, tungsten, or platinum, can confuse airport scanners due to their inability to penetrate these substances. Additionally, while scanners can provide visual clues about the presence of drugs, they cannot directly identify them, requiring manual inspection by security personnel.
| Characteristics | Values |
|---|---|
| Substances detectable by airport scanners | Metal objects, non-metal objects, organic materials, weapons, explosives, drugs, liquids, money |
| Substances not detectable by airport scanners | Gold, tungsten, platinum |
| Other | Airport scanners cannot detect objects inside the body, such as body cavities or operated body parts |
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What You'll Learn
Dense and thick metals
Airport scanners use X-ray or millimetre-wave technology to detect potential threats concealed within passengers' belongings. X-ray scanners are used to check luggage and carry-on bags, while millimetre-wave scanners are used to scan passengers.
X-ray scanners use low-level X-rays to create images of the contents inside bags. X-rays pass through materials at different rates depending on their density. Metal, being a dense material, appears clearly on the scanner screen, often highlighted in a distinct colour such as blue or orange. However, X-ray scanners cannot penetrate highly dense and thick metals, and these objects appear as opaque or dark areas on the images. This opacity indicates the presence of metal, prompting further inspection by security personnel. Some examples of dense metals that X-ray scanners struggle to penetrate include lead and thick stainless steel.
Millimetre-wave scanners, on the other hand, do not see through metal but can detect metal objects on a person's body. The waves are reflected by metal, creating an image of the object's outline. Security personnel can then determine if further inspection is required. These scanners use low-energy, non-ionizing radiation to detect threats. The machine bounces the waves off the body and back to the scanner, and the energy that returns is used to generate an image that can indicate items needing further investigation.
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Gold, tungsten, platinum
Airport scanners use X-rays to penetrate objects and detect prohibited items such as drugs, explosives, inorganic substances, and other non-organic materials. These X-rays are emitted from the scanner and captured by detectors on the other side. The detectors then convert the X-rays into signals, which are transmitted to a processing unit that displays the information as simulated images.
While airport scanners can detect the presence of objects, they cannot always determine their exact composition. However, they can distinguish between organic and metallic substances, as well as identify objects with low or high density.
Gold, tungsten, and platinum are high-density metals that can block X-rays, making it difficult for scanners to see through them. As a result, these metals can appear as dark, opaque images on the scanner, making it challenging to identify objects concealed within them.
Although airport scanners may not clearly differentiate between gold, tungsten, and platinum, security personnel are trained to recognize these dense objects and may conduct further inspections if suspicious activity is detected. It is important to note that attempting to conceal prohibited items within these metals will likely result in confiscation during the security screening process.
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Organic materials
Airport scanners are designed to detect a wide variety of materials, including organic compounds and explosives. The detection of organic materials is one of the most critical functions of airport scanners, as many explosives are made from organic materials. Scanners must be able to differentiate between harmless organic substances, like food, and dangerous compounds.
Airport scanners can detect organic materials by identifying their density and structure. For example, certain drugs may appear similar to harmless organic items, but the scanner’s advanced technology can flag them for further inspection. Scanners can also detect biological material, like weed, which appears orange on the scanner. The quantity carried can impact how it looks on the scanner, with larger amounts appearing as a dense, definite orange mass. If the weed is packed with other organic materials, it may be harder to detect.
Millimetre-wave scanners are used to detect objects concealed on a person’s body. These scanners can detect an organic mass with a large density, which security personnel will then investigate to determine whether the detected item is a drug or not. Scanners can also identify if a person has swallowed drugs, as the stomach will contain packages.
Modern airport scanners are extremely sophisticated and can see everything in your luggage, including any items a passenger attempts to conceal. They can detect both metallic and non-metallic objects, as well as organic materials.
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Metallic objects
Metal objects are one of the most common items that can confuse airport scanners and trigger alarms. Airport scanners are designed to detect metallic objects, and their technology is advanced enough to detect even the smallest amount of metal. This includes miniscule items such as a foil wrapper or the buttons on jeans.
Metal detectors, one of the most commonly used airport security systems, use non-ionizing radiation to scan travellers and their belongings. This type of radiation has enough energy to move atoms in a molecule around or cause them to vibrate, but not enough to remove electrons from atoms. The radiation is sent across the scanned surfaces, and the energy that bounces back helps identify objects that are present.
While metal detectors are effective at identifying small metal items, they may ignore very small amounts of metal, such as small earrings. Additionally, some dense and thick metals can confuse X-ray scanners, appearing as dark areas on the scanned images. Gold, tungsten, and platinum, for example, cannot be detected by X-rays.
It is important to note that metal objects are not the only items that can trigger alarms. Airport scanners can also detect non-metallic objects and organic materials, including drugs, food, explosives, and paper. These organic materials are typically marked with an orange colour on the scanner images.
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Non-metallic objects
Airport scanners are designed to detect a wide range of materials, from metals to plastics, organic compounds, and explosives. They can also identify items based on their shape, density, and other visual cues.
Millimetre-wave scanners, backscatter X-ray machines, and passive infra-red scanners can detect both metallic and non-metallic items, including weapons, explosives, and drugs hidden under clothing or in body cavities. These scanners use non-ionizing radiation to detect threats and create an image for TSA agents to review.
Advanced X-ray scanners can identify non-metallic weapons and explosive components made from plastic or ceramic materials, which older security systems often miss. They can also detect liquids, gels, and aerosols that exceed certain volume limits.
Full-body scanners, which have been adopted in many countries, can detect non-metallic objects, including items swallowed or hidden in body cavities. These scanners have sparked debates about safety and privacy, with some arguing that they violate basic human rights.
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Frequently asked questions
Airport scanners can detect metallic and non-metallic objects, as well as organic materials. They can also detect inorganic substances.
Airport scanners cannot directly detect drugs. However, they can provide visual clues that might suggest the presence of narcotics. Security officers are trained to spot these signs and can take further action if they suspect illegal substances.
No, X-rays cannot detect gold, tungsten, or platinum.
Airport body scanners can detect anything that is not a part of the human anatomy and spot things concealed under clothes and layers. However, they cannot detect objects inside the body, such as body cavities.
