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The X-ray machine for security inspection is mainly used for the security inspection of luggage and parcels in key places such as stations, subways, airports, customs and government departments. Therefore, it is also called the baggage security inspection machine. The technology used is the X-ray scanning technology. However, the problem is that the X-ray is radiated. There is so much traffic in stations and airports every day. Is there any radiation in the X-ray machine for security inspection? How to prevent radiation? These are the issues we want to discuss.
As we know, the X-ray machine for security inspection, like the medical X-ray machine, obtains the internal image of the object by irradiating the detected object with X-rays. However, the radiation dose of the X-ray machine for security inspection is much less than that of the medical X-ray machine, because the image of package security inspection does not need to reach the resolution of medical diagnosis level. According to the national standard, the single inspection dose of the X-ray machine for security inspection shall not be greater than 5 μ Gy, and the X-ray dose at any place 5cm away from the external surface of the equipment (including the entrance and exit of the equipment) shall be less than 5 μ Gy / h, which is the same as that of FDA. In fact, the radiation dose of the X-ray machine used in the subway and airport is much lower than the national standard. Take the imported X-ray machine provided by Shenzhen Fayi Technology Co., Ltd. used in Shenzhen Airport as an example, the single inspection dose is 0.528 μ Gy, the radiation dose at 5cm of the outer surface was 0.655 μ Gy / h, about 10% of the upper limit specified in the national standard. What is this concept? Compare the medical ones. According to the data reported by the United Nations Scientific Committee on radiation effects, the radiation dose of a medical chest X-ray examination is 50 μ Gy [5], that is to say, the X-ray machine for security inspection is about 1% of the radiation of the medical X-ray machine. But some people may think of a question, that is, if you take the subway or often take the high-speed rail plane every day, will the accumulated radiation be harmful? This worry is not unreasonable, but it can be understood that the security personnel who operate the X-ray machines for security inspection every day are around every day. What is the radiation amount? At the end of 2002, the Centers for Disease Control and prevention of the United States conducted a special large-scale radiation dose survey on the security personnel of the five major airports in the United States. The results of the survey report show that the average annual radiation dose received by most airport baggage security personnel due to work is less than 120 μ Gy, less than 600 for a few people μ Gy。 According to the data reported by the United Nations Scientific Committee on radiation effects, the average annual maximum radiation dose received by the general public, except for natural radiation and medical radiation, is 1000 μ Gy, even for airport baggage security personnel, the radiation dose received due to work is far less than this upper limit. It can be seen that the radiation dose of the X-ray machine for security inspection is far less than that of the medical X-ray machine, and it has been fully shielded. Even pregnant women can safely operate this equipment.
Seeing this, you should have no worries, but you may still think that the less the X-ray radiation, the better. How to prevent the radiation of the X-ray machine used for security inspection?
First of all, we should avoid the frequent security check of objects with cumulative effects on X-rays - film. At present, only this article is known to accumulate X-ray radiation and cause radiation. Secondly, when passing through the security check, passengers should not rush to take their luggage to their hands. They should not put their hands into the port of the security check machine. There are some adhesive strips like hanging curtains, which are used to prevent radiation. Do not put any part of the body inside. Although the radiation is very small, it is better to pay attention.