Traditional security inspection machine supplier

If you are worried about this, you'd better communicate with the security inspector, explain the situation to them and open the lid of the calcium tablets for them to see. If it's a gift and you can't open it, you have to go through security. It won't make any difference.

All the above is my own. Here are some information:

How big is the radiation of airport metro X-ray security instrument?

Myth: This kind of security inspection machine, which often appears in railway stations, airports and subway stations, has very strong internal radiation. Many passengers reach for their bags before they come out, which is very dangerous. You should try to stay away from the black shielding strip until it closes, because shaking the shielding strip will also shake out a small amount of radiation.

Truth: The 2008 Olympic Games, the 20 10 World Expo and the Asian Games started the comprehensive security inspection of subways in Beijing, Shanghai and Guangzhou. Many people have to take the subway to and from work every day, and they have shown all kinds of anxiety about this kind of security device, which was originally used only in airports and railway stations, entering the subway. In addition to worrying about the direct impact of radiation on the human body, some people worry that radiation will affect the food in the bag. Is the X-ray security instrument really that scary? Rumor shredder investigators uncover the truth for you.

Like the medical X-ray diagnostic instrument, the baggage X-ray security instrument obtains the internal image of the object through X-ray irradiation, but the radiation dose of the package security instrument is far less than that of medical X-ray diagnosis, because the image of package security inspection does not need to reach the resolution of medical diagnosis level [1]. According to the national standard GB 15208. 1-2005, the single inspection dose of the X-ray security instrument should not be greater than 5μGy, and the X-ray dose should be less than 5 μ Gy/h at any place 5cm away from the external surface of the equipment (including the entrance and exit of the equipment), which is the same as that stipulated by the US FDA [3]. In fact, the radiation dose of X-ray security devices used in subways and airports is far below the national standards. Taking the X-ray security inspection equipment produced by Shanghai Gaojing Imaging Technology Co., Ltd. used in Shanghai Metro as an example, according to the data provided by official website, the single inspection dose is 0.534μGy, and the radiation dose at the outer surface of 5cm is 0.788μGy/h[4], which is about110 of the upper limit stipulated by the national standard. According to the data reported by the Scientific Committee on Radiation Effects of the United Nations, the radiation dose of a medical chest X-ray examination is 50μGy[5], that is to say, even if people are really put into this X-ray security device used in Shanghai subway, it will take about 100 scans to reach the radiation dose accepted by a chest X-ray examination-not to mention this situation is impossible.

Some people may ask, I take the subway every day, and the number of times is more. Will the accumulated amount be harmful? At present, we don't have clear data on the radiation dose that ordinary passengers receive security check every year. However, compared with ordinary passengers, the operators of security devices are obviously exposed to more radiation, especially airport baggage security personnel, who often need to manually load and unload security devices. In 2003, the US Centers for Disease Control and Prevention conducted a large-scale radiation dose survey on baggage security personnel at six major airports in the United States. The results of the investigation report show that the average annual radiation dose of airport baggage security personnel is less than 1.2 mrem, that is, 1.20μGy, and the rest are basically less than 60mrem, that is, 600μGy[6]. According to the data reported by the United Nations Scientific Committee on Radiation Effects, except natural radiation and medical radiation, the average annual upper limit dose of radiation received by the general public is 1000μGy[5], even the baggage security personnel at the airport are far from reaching this upper limit. The American Society of Health Physics also pointed out that even pregnant women can safely operate the baggage X-ray security device, because the radiation dose of the baggage X-ray security device is much smaller than that of the medical X-ray machine, and it has been completely shielded [1].

So does the X-ray security instrument have any effect on the scanned items? Because the radiation of the baggage X-ray security device is very small, the impact on the scanned items themselves can be ignored. But there is a special article-film, which is very sensitive to X-ray radiation. According to the experimental results of NAPM on films with different sensitivities from different manufacturers in 1994, the film with ISO 1600 sensitivity did not find any imaging abnormality after 16 x-ray baggage scanning, but found slight imaging abnormality after 100 scanning [7]. Kodak's suggestion is that "it is best not to carry out X-ray security inspection for films above ISO400" [8]. According to the data of Gaojing Company, a security equipment supplier used in Shanghai Metro, the model with the highest single dose (which is close to the limit set by the national standard) also shows the safety of ISO 1600 film [9]. The sensitivity of most photographic films we use every day is lower than ISO400. On the whole, it is generally considered that ordinary photographic films (excluding X-rays or other films with strict requirements for imaging) are safe under normal travel conditions through the security inspection equipment used in airports and subways at present. However, because the influence of X-rays on films can be accumulated, it is necessary to avoid passing X-ray security inspection for films with high sensitivity many times. It should be pointed out that X-rays have no effect on digital cameras, and you can pass the security check safely.

In addition, unlike the radioactive element particles leaked from the Fukushima nuclear accident, X-ray scanning will not cause radioactive pollution. After scanning, radioactive substances will not remain on the luggage, and the food scanned by X-ray will not cause harm to human health.

Conclusion: Exaggerate the facts. The internal radiation of the X-ray security device used in airport metro is not "very strong", and the dose is much smaller than that of the X-ray machine used for medical diagnosis. The radiation around the machine is very weak, so even full-time operators can work safely without protection. Although reaching into the cover strip to get the bag does increase the amount of radiation to a certain extent and should be avoided as far as possible, it is not a "very dangerous" thing.

References:

[1] American Society of Health Physics-Frequently Asked Questions on X-ray Packaging Inspection

[2] GB15208.1-2005 National Standard for Micro-dose X-ray Safety Inspection Equipment

[3] FDA-CFR 2 1, technical standard of ionizing radiation generator.

[4] GJ-XS6550 X-ray security equipment

[5] Shell Network-Earthquake Special Edition illustrated daily life and radiation

[6] The evaluation report of the US Centers for Disease Control and Prevention on the radiation dose received by airport baggage security personnel.

[7] How safe is the film airport X-ray scanner?

[8] Influence of luggage X-ray scanning on film

[9] GJ-XS5030 X-ray security equipment