"Hello, doctor! I am a pregnant woman who is 3 months pregnant. I used to walk to and from get off work. Recently, the weather is getting hotter and hotter. I can only take the subway home. I would like to ask about the safety of the subway security inspection equipment for pregn

"Hello, doctor! I am a pregnant woman who is 3 months pregnant. I used to walk to and from get off work. Recently, the weather is getting hotter and hotter. I can only take the subway home. I would like to ask about the safety inspection equipment of the subway. Will it affect pregnant women? "

" Doctor, I have milk powder and bottles in my backpack, which are for babies. Do I need to go through the security check? "

Novice mothers. We are really worried about the safety of our babies. There are not a few mothers like the two mothers at the beginning who are worried about the subway security scanners. Due to the different construction conditions of subways in various cities in the country, some have baby-mother passages and some do not. In order to reassure everyone, today I will tell you about the safety issues of subway and train security detectors.

• Types of security checkers

Generally, there are three types of security checkers in subway stations, train stations and airports:

The first type is a security checker held by the staff, which uses a "scan" action to detect whether passengers are carrying contraband. This handheld security detector is actually an metal detector , which uses the principle of magnetic field induction to work. It has no ionizing radiation itself and does no harm to the human body.

The second type is the door type detector, which is mainly used for passenger passage inspection. This security door is also an metal detection door . Like the handheld security detector, there is no ionizing radiation. They all work through the principle of magnetic induction and do not affect human health. This is what pregnant mothers have to go through at the beginning.

The third type is the security inspection device with a black curtain that is used to pass through luggage. The lunch boxes, backpacks, and suitcases that everyone usually carries need to be passed through. This kind of security inspection device mainly checks through X-rays and -rays. There is a certain amount of radiation that is harmless to the human body within the specified intensity.

• Do special groups of people (such as pregnant mothers and the elderly) need to avoid security inspection machines?

From the previous introduction of the three types of security detectors, you can see that neither handheld security detectors nor door-type security detectors are ionizing radiation, and all people can pass normally.

There is only the third type of security detector with leather curtain. Because of the ionizing radiation, everyone can stay away from it in life. Especially when items pass through the security detector, do not open the curtain and take things directly because you are anxious.

Anyone who has been to the hospital for X-ray or CT examination should have had this experience: every time before entering the examination room, the doctor will ask if there are any pregnancy preparation plans in the past six months. If so, the doctor will generally advise against it. This type of inspection. This also shows that X-ray examination has a certain impact on the human body.

But you don’t have to worry too much. Although the baggage security scanner uses More than 5μGy/h.

Usually it takes less than a minute for us to go through the security check, and the dose of radiation we receive is only one-half millionth of the safe dose (50 mGy) at most, so there is no need for special protection at all.

In addition, the ray device of the subway security inspection machine is classified as an X-ray luggage inspection device and is a Class III ray device, which will not cause radiation damage to the exposed personnel.

Therefore, the radiation from the security checker is not harmful to pregnant mothers or children. If you are really worried, just go through the security check quickly next time and don’t linger ~

• You can still eat food after it has passed the security checker. What?

Many office workers don’t have time to eat in the morning, so they usually take breakfast with them on the subway; some mothers travel with a lot of stuff for their children, and their baby’s milk powder has to go through the security inspection. So people always ask, can food still be eaten after it has passed the security inspection?

As we have introduced before, the amount of radiation emitted by luggage security scanners is very small, and can almost be described as a trace amount. When luggage passes through the security checker, the X-rays inside will not cause nuclear reactions in our luggage, so no radioactivity will be generated. In this way, the items that pass through will have no radioactive residue and can be eaten with confidence.

Since the X-ray radiation of luggage security inspection machines is low and does not harm the human body, the country exempted this type of security inspection equipment from management in 2015. As long as subway stations, railway stations, airports and other units operate it correctly and maintain it regularly, Ensure that protective measures are complete and effective, and everyone’s safety can be guaranteed.

To summarize briefly, the radiation from security detectors in subway stations and airports is harmless to the human body. Before entering the relevant public transportation, everyone must conduct security checks as required ~

If you are still worried, remember not to open your luggage during the security check. Do not block the curtains of the security checkpoint at the security checkpoint. Stay less and pass quickly, and the radiation will be far away~