Lois Larson
Airport security systems use metal detectors, millimetre wave scanners, and cabinet X-ray machines to ensure the safety of passengers and staff. X-ray machines are used to scan carry-on items and checked luggage, and can detect metallic and non-metallic objects, as well as organic materials such as drugs or explosives. They can also detect swallowed items or items hidden in body cavities. While X-ray technology is generally considered safe, with extremely low levels of radiation, there has been some debate about the potential health risks of full-body backscatter X-ray scanners.
| Characteristics | Values |
|---|---|
| Purpose | To detect threats and prevent dangerous items from being transported onto aircraft |
| Detection | Metallic and non-metallic objects, organic materials, money, paper, drugs, swallowed items, items hidden in body cavities |
| Radiation | Low levels of radiation, including non-ionizing and ionizing radiation |
| Safety | Safe for passengers and workers, no damage to film or electronic media |
| Image | Generic outline of a person, gingerbread man or paper doll avatar |
| Privacy | Image storage features disabled, no recording of images |
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What You'll Learn
X-rays can detect metallic objects
X-rays are used in airport security systems to detect metallic objects. They can identify hidden weapons and other hazards that are not approved for safe airline travel. X-ray machines are used to screen carry-on items and checked luggage. They can detect the smallest amounts of metal, even if the metal is wrapped in foil or metallized film. This is because X-rays can pass through low-density materials, such as skin and flesh, but are absorbed by higher-density materials such as bone or metal.
X-rays work by releasing electromagnetic waves that pass through the bag and calculate the mass and density of the contents. If something seems suspicious, a Transportation Security Officer (TSO) will investigate further. The scanners can detect the density and mass of all objects in the luggage, but they cannot always establish what the objects are. For example, they cannot detect drugs, but they can provide visual clues of drugs hidden in baggage or on a person.
In addition to detecting metallic objects, X-ray machines can also detect non-metallic objects and organic materials. They can detect paper and even pills in plastic, non-metallic, or metallic bottles. They can also detect money, especially if it is arranged in bundles.
X-ray technology is also used in food inspection to detect metal contaminants. It is effective for unpackaged and bulk food products, as well as packaged products, including those in metallized film packaging. X-ray inspection provides consistent results and is not affected by packaging type, temperature, moisture, or salinity.
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They can also detect non-metallic objects
Airport security systems use metal detectors, millimetre wave scanners, and cabinet X-ray machines to ensure the safety of passengers and staff. The X-ray machines used to screen carry-on items and checked luggage can detect non-metallic objects.
Full-body scanners, which have been in use since 2007, can detect non-metal objects. These millimetre wave scanners use non-ionizing electromagnetic radiation to detect suspicious metallic and non-metallic objects hidden under clothing or in shoes and body cavities. They can also detect swallowed items.
Objects made from non-metallic substances such as plastics, ceramics, and glass are identified through their density and atomic number, which affect how much they absorb or scatter X-rays. This makes it possible for scanners to detect items such as plastic explosives or other contraband that could threaten aircraft security.
The dual-energy X-ray system used in airports has a single X-ray source that emits X-rays in the range of 140 to 160 kilovolt peaks (KVP). The higher the KVP, the further the X-ray penetrates. After passing through the item, the X-rays are picked up by a detector and passed through a filter that blocks out lower-energy X-rays. The remaining high-energy X-rays hit a second detector, and a computer circuit compares the data from both detectors to better represent low-energy objects, such as organic materials.
All X-ray systems use shades of orange to represent organic materials because most explosives are organic. Machine operators are trained to look for anything that could be a component of an improvised explosive device (IED).
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They can identify organic materials
Airport scanners use X-rays to identify organic materials. They can detect a wide range of materials, including metals and plastics, as well as organic compounds and explosives. The X-rays help security personnel identify potentially dangerous items without needing to search manually. They can also detect the smallest amounts of metal and paper.
The ability to detect organic materials is one of the most important functions of airport scanners. This is because explosives can be made from a wide range of materials, many of which are organic. Therefore, scanners must be able to differentiate between harmless organic substances, like food, and dangerous compounds.
Airport scanners are equipped with Explosive Detection Systems (EDS), which identify the molecular makeup of explosives. EDS works by analyzing how organic compounds absorb X-rays, which helps detect even trace amounts of explosives in luggage or on a person's body.
Organic materials are substances that contain carbon and are usually derived from living organisms. They include many types of contraband, such as illegal drugs, which are made from organic compounds. Airport scanners can identify these materials by recognizing their density and structure. For example, certain drugs may resemble harmless organic items, but the scanner's advanced technology can flag them for further inspection.
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X-rays can detect swallowed items
X-ray technology is used in airport security systems to ensure the safety of passengers and staff. While the primary function of these scanners is to detect potential threats, such as weapons, chemicals, and liquids, they can also identify swallowed items.
Airport scanners can detect metallic and non-metallic objects, as well as organic materials, by releasing X-rays that pass through luggage and passengers' bodies, calculating the mass and density of the contents. This technology can identify swallowed items, such as drugs, pills, and even non-metallic foreign objects.
In the case of detecting swallowed items, full-body X-ray machines are used. These machines can identify packages in a person's stomach, regardless of whether they are wrapped in plastic, non-metallic, or metallic materials. This technology is particularly useful in detecting drug smuggling, as it can identify pills or other substances, even in liquid form.
While X-ray technology is effective, it is not perfect. The visibility of swallowed items depends on various factors, including the object's size, shape, composition, and surrounding materials. Additionally, the interpretation of X-ray images requires expertise, and radiologists may sometimes fail to identify certain objects.
It is important to note that airport body scanners prioritize privacy while maintaining security. These scanners use generic human forms to indicate the presence of potential threats, rather than revealing detailed images of an individual's anatomy.
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They can detect paper and money
Airport security systems use metal detectors, millimetre wave scanners, and cabinet X-ray machines to ensure the safety of passengers and staff. X-ray machines are used to screen carry-on items and checked luggage.
X-ray scanners can detect paper and money. They can identify organic materials, including paper, and they can detect even the smallest amounts of metal, which would include paper currency. If the currency is arranged in bundles, it will be more easily detected.
The technology behind scanners is complex, but the process of scanning a person's body and luggage is simple. Once luggage is inside the scanner, X-rays are released to pass through the bag and calculate the mass and density of the contents. Scanners can see the density and mass of everything packed but sometimes struggle to establish what the objects are. If luggage contains suspicious objects, security will search the bag.
While X-ray scanners can detect paper and money, they cannot detect drugs. However, they can provide visual clues of drugs hidden in luggage or swallowed by a passenger. In the latter case, a full-body X-ray machine can detect packages in a person's stomach, even if they are contained in plastic, non-metallic, or metallic bottles.
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Frequently asked questions
Airport X-rays can see metallic and non-metallic objects, as well as organic materials. They can detect the density and mass of objects, but not always what they are. They can provide visual clues about drugs hidden in luggage or under clothing.
Yes, airport X-rays can detect even small amounts of metal, including paper money if it is bundled.
While airport X-rays are not designed to detect drugs, they can provide visual clues about drugs hidden in luggage or under clothing.
Airport X-ray technology is designed to keep radiation inside the machine and protect operators and passengers. The amount of radiation used is extremely low and does not pose any health risks. The FDA and CDC also have safety measures in place to limit radiation exposure.
