Is the security door harmful to human body?

Securitydoor is a kind of detection device to detect whether people carry metal objects, also known as Metal detection door. As the name implies, the function of the security gate is to detect whether people passing through the security gate carry metal objects. Simply speaking, its working principle is to form magnetic field conversion, so that metal objects can be electromagnetically induced and found. Some high-grade security doors can further perceive the shape of metal objects to judge whether they are dangerous goods such as knives. To sum up, the security gate is passively inspected by magnetic field, rather than irradiation in the traditional sense. To make an inappropriate metaphor, we can regard the security gate as a super simplified version of the nuclear magnetic machine. Having said that, I think everyone has understood that the security gate has put an end to the so-called radiation hazard in principle, and passing through the security gate, or even passing through the security gate many times a day, will not cause harm to the body.

here, let's popularize the radiation that people often mention. Radiation is divided into ionizing radiation and non-ionizing radiation. The former has high energy, which can make atoms or molecules produce rotation and electric phenomena, such as nuclear radiation and X-ray radiation, which we must protect. The radiation sources we encounter in our daily life, such as WIFI, mobile phones and sunlight, belong to non-ionizing radiation. In principle, this kind of radiation will not change the properties of objects, but the research on the harmfulness of large doses of this kind of radiation is still in progress, so countries all over the world still set corresponding restrictions on the generation of this kind of radiation. China's safety standard is 4 microwatts per square centimeter (? W/c㎡) is safe.

in our daily life, we are exposed to radiation, such as the radiation of mainstream wireless routers is 24-31 (? W/cm2), while the mainstream mobile phone is 17-25? W/cm2, which surged to 93? W/cm2。 What we need to point out is that the distance loss of non-ionizing radiation is great. When the WIFI signal of the wireless router travels 1 meter in the air, the radiation level will drop to 4.5-6.8? W/cm ~ 2, and it drops to .8 after 2 meters? W/cm2, far below the national standard.

In short, as a member of medical institutions, we should know more scientifically about radiation. The radiation generated by security doors and WIFI signals will not be harmful to our health. If there is, it will be much less harmful than long-term chatting with mobile phones and irregular contact with radioactive sources such as X-ray examination and interventional examination of drugs.

conclusion: the harm caused by ordinary security doors to human body can be ignored.

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