Roberta Aguirre
Airport security systems use metal detectors, millimeter wave scanners, and cabinet X-ray machines to ensure the safety of travellers. X-ray machines are used to screen carry-on items and checked luggage, and they can detect distinct items inside a bag. Full-body scanners, on the other hand, can detect non-metal objects and items hidden in body cavities, but they do not use X-rays and do not reveal what is inside the body. There are concerns about privacy and health risks associated with full-body scanners, especially in the case of children and religious minorities.
| Characteristics | Values |
|---|---|
| Purpose | To keep people safe while travelling |
| Function | Detects items that may be hidden |
| Types | Metal detectors, millimeter wave scanners, cabinet x-ray machines, backscatter x-ray scanners |
| Radiation | Low-level radiation, non-ionizing radiation, ionizing radiation |
| Safety measures | To limit passenger and worker exposure to radiation |
| Privacy measures | Blurred images of the face, less provocative images, chalk outline of subjects |
| Effectiveness | Can detect non-metal objects, swallowed items, items hidden in body cavities |
| Limitations | May not detect bombs hidden in electronic devices |
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What You'll Learn
X-ray machines can detect items hidden in luggage
X-ray machines are used to detect items hidden in luggage at airports. They are an essential tool for ensuring the safety of passengers and staff. These machines use dual-energy X-ray systems, with X-rays passing through a detector, a filter, and then another detector. This process allows the machine to differentiate between various materials, as they absorb X-rays at different levels, and display distinct items inside the luggage on a monitor.
The Transportation Security Administration (TSA) in the United States utilizes X-ray equipment to screen carry-on items and checked luggage. These X-ray machines are carefully maintained and regularly tested to ensure they meet safety standards and limit radiation exposure for both passengers and workers.
In addition to X-ray machines, other screening equipment at airports includes metal detectors and millimeter wave scanners. Metal detectors use magnetic fields to identify metal objects, while millimeter wave scanners emit low-energy waves to capture reflected energy and generate an image. These scanners are particularly useful for detecting non-metal objects, addressing concerns that arose after airliner bombing attempts in the 2000s.
To further enhance security, some airports have implemented chemical sniffers. These devices can analyze swabs taken from electronic devices or luggage for traces of explosive or narcotic chemicals.
While X-ray machines and other screening technologies play a crucial role in ensuring airport security, there are ongoing discussions about privacy and health concerns associated with certain types of scanners, particularly those that create detailed images of individuals' bodies.
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They can also detect items on a person
Airport security systems use metal detectors, millimetre wave scanners, and cabinet x-ray machines to ensure the safety of travellers. These devices can also detect items that may be hidden on a person.
Metal detectors use magnetic fields to identify metal objects. The magnetic field is produced by a brief pulse of electrical current, and when there is a metal object on a person, the magnetic field is reflected back to the machine, which then beeps to alert the TSA agent.
Millimetre wave scanners emit extremely low-energy waves, capturing the reflected energy. These scanners do not penetrate the skin and do not see anything inside a person. They generate a neutral avatar to indicate where alarms occurred, so the TSA knows where to pat down.
Backscatter x-ray scanners, on the other hand, utilize very low-dose x-rays to generate extremely detailed and revealing images of those scanned. They detect radiation that reflects off the person being scanned. The energy from the scan is absorbed by the superficial tissues of the body, such as the skin. The images produced reveal outlines of the body, including genitalia, breasts, buttocks, and prosthetics. To address privacy concerns, the TSA has implemented measures such as blurring faces and installing software to make the images less provocative.
In addition to these methods, some airports also use chemical sniffers to detect explosives and narcotics. These devices can analyse cloth swiped from electronic devices or other enclosed spaces for traces of chemicals used in bomb-making.
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Full-body scanners can detect non-metal objects
Full-body scanners have been used in airports since 2007 to supplement metal detectors. They are used to detect objects on or inside a person's body for security screening purposes, without physically removing clothes or making physical contact.
Unlike metal detectors, full-body scanners can detect non-metallic objects, such as explosives, which became a significant concern after various airliner bombing attempts in the 2000s. Some scanners can also detect swallowed items or items hidden in body cavities.
There are two types of full-body scanners: millimeter wave scanners and backscatter x-ray scanners. Millimeter wave scanners emit extremely low-energy waves and capture the reflected energy. The scanners use non-ionizing electromagnetic radiation similar to that used by wireless data transmitters, in the extremely high-frequency (EHF) radio band. The health risks posed by these machines are still being studied, but millimeter wave scanners do not generate ionizing radiation.
Backscatter x-ray scanners use low-dose radiation to detect suspicious metallic and non-metallic objects hidden under clothing or in shoes and body cavities. The dosage of radiation received is usually between 0.05 and 0.1 μSv. The use of backscatter x-ray scanners has sparked considerable debate regarding safety, leading multiple countries to ban them.
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X-ray machines do not damage film or electronic media
X-ray machines used at airport security are typically dual-energy X-ray systems. These systems have a single X-ray source that emits X-rays, usually ranging from 140 to 160 kilovolt peaks (KVP). The KVP value indicates the penetration level of an X-ray, with higher values denoting greater penetration. After passing through an object, the X-rays are detected, and a computer circuit analyses the data to generate an image that distinguishes between different types of materials.
While X-ray machines can damage film, it is important to distinguish between different types of film and X-ray machines. Traditional X-ray machines used for carry-on luggage typically emit a mild dose of X-rays, which is considered safe for film below 800 ISO. However, CT scanners and high-energy X-ray systems used for checked baggage can damage film. These machines emit higher levels of radiation that may ruin the film, causing fogging and a loss of detail and colour accuracy.
To address concerns about potential damage to film, some sources recommend requesting a hand inspection of carry-on luggage containing film. Additionally, marking film with a "Do Not X-ray" label and placing it in a clear plastic bag can help ensure its safety.
Regarding electronic media, there is no need for concern. Electronic devices, such as laptop computers, can withstand significantly more radiation than film without sustaining damage. While X-ray machines may not reveal the presence of bombs hidden within complex electronic devices, additional security measures are in place, such as chemical sniffers that detect trace residues of bomb-making chemicals. Therefore, travellers should not worry about their electronic devices being damaged by X-ray scanning.
In summary, while X-ray machines at airports have the potential to damage certain types of film, they do not pose a risk to electronic media. Travellers can take precautions to protect their film, such as requesting hand inspections and using appropriate labels and bags. However, electronic devices can safely pass through X-ray security without any adverse effects.
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The TSA uses x-ray machines to screen carry-on items and checked luggage
The Transportation Security Administration (TSA) uses x-ray machines to screen carry-on items and checked luggage for dangerous items such as weapons, chemicals, and liquids. The TSA's x-ray equipment must meet FDA requirements to limit passenger and worker exposure to radiation. The FDA's Center for Devices and Radiological Health (CDRH) ensures that all x-ray systems and other radiation-emitting screening equipment are built to use radiation safely.
X-ray machines used in airports are typically based on a dual-energy X-ray system, with a single X-ray source emitting X-rays in the range of 140 to 160 kilovolt peak (KVP). KVP refers to the penetration level of an X-ray, with higher KVP values indicating greater penetration. In a dual-energy X-ray system, the X-rays pass through a detector, a filter, and then another detector. The detector picks up the X-rays after they pass through the scanned item, and the filter blocks out the lower-energy X-rays. The remaining high-energy X-rays hit the second detector. A computer circuit compares the readings from the two detectors to better distinguish low-energy objects, such as organic materials. Different materials absorb X-rays at different levels, allowing the machine operator to see distinct items inside a bag.
In addition to X-ray machines, the TSA employs other screening technologies, including metal detectors, millimeter wave scanners, and chemical sniffers. Metal detectors use magnetic fields to identify metal objects. Millimeter wave scanners emit extremely low-energy waves and capture the reflected energy to generate an outline of the human body, helping to identify contraband hidden under clothing. Chemical sniffers, used for random checks or when there is a suspicion about an electronic device, can detect trace residues of chemicals used in bomb-making.
TSA officers may instruct travelers to separate certain items, such as foods, powders, and electronic devices, from carry-on bags to facilitate clear X-ray images. It is recommended to keep bags organized to ease the screening process and ensure the safety of all travelers.
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Frequently asked questions
Airport X-ray machines are used to screen carry-on items and checked luggage for items that are not approved for air travel.
Airport X-ray machines typically use a dual-energy X-ray system with a single X-ray source. The X-rays pass through a detector, a filter, and then another detector. The X-rays are then picked up by a detector, which passes them to a filter that blocks out lower-energy X-rays. The remaining high-energy X-rays create an image on the monitor, allowing the operator to see distinct items inside the bag.
While airport body scanners can detect items hidden under clothing, they do not produce X-ray images that show bones or organs. Instead, they generate a generic or blurred outline of a person's body and highlight areas that may require further inspection.
Airport X-ray machines emit low levels of radiation that are considered safe for human exposure. Regulatory bodies like the FDA and TSA have implemented guidelines and safety measures to limit passenger and worker exposure to radiation and protect their privacy.
Modern carry-on X-ray systems are considered film-safe and will not damage electronic media. However, high-energy X-ray systems used for checked baggage may damage film, so it is recommended to carry film with you on the plane.
