Through searching, I found that subway walk-through metal detectors are generally called security metal detectors.

Does it have radiation? A little.

How does it work?

What are the big manufacturers? Many. Big manufacturers, small factories. Imported.

Can I eat food that has been inspected? It’s best to hold it in.

Does the security metal detector have radiation?

Can I see the bones of the body?

The security metal detector is a device that uses electromagnetic waves to detect metal objects, and it does not generate any radiation.

The working principle of walk-through metal detectors is to use the reflection and scattering of electromagnetic waves to detect metal objects carried by pedestrians, including keys, mobile phones, metal accessories, etc. It usually uses low-frequency electromagnetic waves, which are similar to radio waves and will not cause harm to the human body.

The detection range of the security metal detector is very small, only within the detection area of the walk-through metal detector, and the detection range is usually no more than a few meters. Moreover, the electromagnetic wave power of walk-through metal detectors is also very low, far below the radiation standard value of radio equipment.

Of course, for those who are particularly sensitive, such as pregnant women or patients with artificial hearts, they may need to pay special attention to the impact of walk-through metal detectors on their bodies. But this situation is also very rare. Under normal circumstances, ordinary people do not need to worry about radiation problems when passing through walk-through metal detectors.

In general, the detection principle and radiation power of security metal detectors are similar to those of common electronic devices in daily life such as mobile phones and televisions, so we should correctly view the impact of walk-through metal detectors on the human body and don't worry too much.

How does a security detector work?

A security detector is a device used for security inspections. It uses technologies such as X-rays and metal detectors to check whether the items people carry are dangerous or illegal. The working principle of the security detector is as follows:

First, when a person passes through the security detector, they are asked to put all the items together, including all metal and non-metal items. These items are transported to the detector part of the machine via a conveyor belt.

At this time, the X-ray device begins to scan people's items. The X-rays are transmitted to the items, some are absorbed by the items, some are reflected back by the items, and the other part passes through the items and is detected by the receiver.

When X-rays hit metal objects, they bounce back and form a "shadow". This process is captured and monitored by the X-ray detector, allowing the operator to observe whether there are any dangerous items hidden inside the objects. At the same time, the metal detector will emit a sound or flash a light to the operator to inform him that a metal object has been scanned. If the security machine detects possible dangerous or suspected dangerous goods, the operator should further check the details of the items or the situation of the relevant personnel. If no problems are found, the passenger can continue to pass through the security machine, retrieve their belongings, and start a new journey to the travel destination.

In short, the purpose of the security machine is to ensure the safety of airports, stations, museums, entertainment venues, office buildings or other types of facilities, and reduce unnecessary suspicion or misjudgment. With the help of the security machine, people can carry their valuables with confidence, and at the same time they can focus on dealing with emergencies.

Is the cargo security machine harmful to the human body?

Cargo security machines usually use X-ray technology to check cargo and luggage, which will generate a certain degree of electromagnetic radiation. However, this radiation level is far below the level that will affect human health. Therefore, under normal operating conditions, cargo security machines will not cause harm to the human body.

To ensure safety, the radiation level of cargo security machines is strictly regulated and limited. In addition, when using cargo security machines, protective barriers such as lead glass or barriers are usually provided to further reduce the impact of radiation on operators.

In addition, modern cargo security machines usually use low-dose X-ray technology to reduce the impact of radiation on people and the environment. These technologies allow cargo security machines to strike a balance between safety and efficiency.

In general, cargo security machines will not cause harm to the human body under normal use. However, any form of electromagnetic radiation may have an impact on humans and the environment, so unnecessary radiation exposure should be reduced as much as possible.

To ensure safety, the radiation level of cargo security machines is strictly regulated and limited. In addition, when using cargo security machines, protective barriers such as lead glass or barriers are usually provided to further reduce the impact of radiation on operators.

In addition, modern cargo security machines usually use low-dose X-ray technology to reduce the impact of radiation on people and the environment. These technologies allow cargo security machines to strike a balance between safety and efficiency.

In general, cargo security machines will not cause harm to the human body under normal use. However, any form of electromagnetic radiation may have an impact on humans and the environment, so unnecessary radiation exposure should be reduced as much as possible.

Subway walk-through metal detectors radiation

The radiation involved in subway security inspection is mainly electromagnetic radiation through walk-through metal detectors.

Subway walk-through metal detectors generally use the principle of electromagnetic induction for detection. When a person passes through the walk-through metal detectors, the walk-through metal detectors will generate a certain electromagnetic field, and detect whether contraband or dangerous goods are carried by measuring the changes in the electromagnetic field. This electromagnetic field is generated on the walk-through metal detectors by low-frequency alternating current.

The radiation of low-frequency electromagnetic fields is mainly static electric and magnetic fields, and the radiation intensity is relatively low, which will not produce obvious biological effects on the human body. According to international safety standards, the radiation intensity of subway walk-through metal detectors should be controlled within a safe range and will not harm human health. Therefore, after reasonable design and installation, ordinary passengers will not be affected by radiation when passing through walk-through metal detectors.

Can subway walk-through metal detectors see what is worn inside the body?

No

The principle of walk-through metal detectors is mainly to perform security checks by detecting the presence of metal objects. It cannot see the inside of the body, such as the wearing of clothes. However, if there are metal objects on the body, such as metal jewelry or metal materials implanted in the body, walk-through metal detectors can detect them. Therefore, if you do not carry any metal objects, or the prosthesis does not contain metal or other metal products, then even if you cannot pass the walk-through metal detectors, you will not be stopped. In some cases, staff may ask passengers to show the items on their bodies to prove their safety.

Walk-through metal detectors cannot display images of specific body parts or underwear. The specific details and capabilities of walk-through metal detectors technology may vary by region and device. In some regions, walk-through metal detectors may use other technologies or add additional features, such as X-ray scanning or facial recognition. But in general, the main purpose of walk-through metal detectors is to detect dangerous objects, not to display images of body parts or underwear.