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Are security doors and security instruments really harmful to health?

2019-10-23 15:29:32 Announcer:Shenzhen Fangji Infinite Technology Co., Ltd.
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   We often enter various public places in urban life and inevitably pass these safety devices many times. Many people here worry that these detection devices will pass us. If there are any prohibited items in our physical examination, will there be radiation?



  The first thing we say is the inspection door. The exact expression is called a metal detection gate. In fact, when we passed the airport security check, we used a doorbell. If you have metal parts on your body, you will beep when you pass by.

First of all, we must first understand a common sense that any electronic product has a certain amount of electromagnetic radiation. There is also a lot of electromagnetic radiation around us. Such as radios, televisions, cell phone towers, high-voltage lines, computers, televisions, microwave ovens, induction cookers, cell phones, etc.

Compared with these electronic products, the safety door has the smallest electromagnetic radiation, and the metal safety door is used for metal detection through the principle of electromagnetic conversion. On both sides of the general security inspection door, sensors that emit and receive electromagnetic signals are installed to form stable electric and magnetic fields. When a metal object passes through the security inspection door, the metal object will cut off the magnetic field lines, generate a current signal, and change the original stable electromagnetic field. Therefore, by detecting the electromagnetic signal, it can be determined whether the passing person carries a metal object. Therefore, the safety door is a weak magnetic field induction technology, the power is very low, the power of the mobile phone is much lower during the call! The radiation is less than the computer monitor. Therefore, the electromagnetic radiation of the safety inspection door is safe.

Then we will discuss the safety x-ray machine. This fat guy is also known as a security officer or luggage security officer. Everyone is familiar with it. It is the main baggage inspection equipment for subways and airports. The principle is very simple, namely the ability to use x-rays to penetrate matter. Different densities, different thicknesses, different compositions, and different x-ray penetration capabilities. X-ray machines are based on the ability to penetrate different substances to identify objects in luggage. Since this kind of thing can penetrate luggage, the radiation must be high? On the top, the x-ray machine housing is shielded by lead, and no surroundings are detected. There is no such thing as an entrance or an exit, because x-rays are very directional and cannot be bent in the air. Curtains prevent hands from reaching out, and high energy can only be blocked by leaded rubber. Don't tell me this is pure lead curtains, lead is metal, light and soft. In fact, whether radiation has any effect on the human body depends on the amount of radiation. There is no measurement, it is said that the safety factor of rogue x-ray security inspection machine depends on the amount of radiation received. The total radiation dose is the radiation time and human body radiation adjustment function. In addition, even if the safety inspection machine leaks due to quality problems, it will only have a small impact on employees who work long hours (work efforts of friends engaged in safety inspection work) Will have a great impact on those people. Who is passing No, although this part uses a machine with radiation, check that the luggage does not cause any harm to our body. Some friends are worried about radiation leakage. By looking at the data of the brand x-ray security inspection machine, the leakage dose is 0.05μGy / h or lower, which is a very small sequence. If a worker works 8 hours a day 365 days a year, the absorbed dose in one year is 0.146 mSv, which is equivalent to the dose from Beijing to London, so the leakage dose is very small.

In order to eliminate everyone's doubts, we measured and tested the safety of the x-ray machine in the field. The radiation data detected on the side of the machine is 5 to 10 cm from the surface of the machine. The detected radiation data is similar to the radiation data measured in the natural environment. The measured values at the inlet and outlet are slightly higher by about 10 cm. Therefore, there is basically no radiation leakage on the side of the x-ray machine, and the farther away from the safety inspection machine, the smaller the amount of radiation leakage. According to China ’s Basic Standards for Protection against Ionizing Radiation and Safety of Radiation Sources ), A person standing at the entrance and exit of the security inspection machine about 10 cm, the cumulative amount will not reach 52 consecutive days. The amount of radiation is not enough to cause radiation damage to the human body, including pregnant women who will not affect the abdomen baby when they pass the security check. Pregnant women can rest assured!

In fact, if there is an ionizing radiation device, the use of such ionizing radiation equipment must be strictly approved by the relevant departments, and the radiation label must be clearly marked, otherwise it is illegal.


There is also a more advanced security technology called millimeter wave technology. The United States has more airports, but it still seems to have no domestic airports.


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