Now working in first-tier cities, most of the pregnant women take the subway to and from work, every day you need to go through a few security doors, some pregnant women are also worried about security doors will not have an impact on the pregnant women? Airport and subway security equipment is mostly X-ray security equipment, through the X-ray on the object to irradiate, get the internal image of the object. However, the subway used on the X-ray security checker radiation dose is far less than medical X-ray diagnostic instrument, because the image of the parcel security does not need to reach the level of resolution of the medical diagnostic, China's regulations, the production of X-ray detector of a single inspection dose of more than 5 millimeters of the unit is not adsorbed, and its quality standards and the U.S. FDA standards are the same.
In fact, the subway in the use of X-ray scanner radiation dose is far lower than the national standard. The single inspection dose of the X-ray security equipment commonly used in the subway is 0.534msUS. the radiation dose at 125px of the outer surface is 0.788msUS, which is about 1/10 of the upper limit set by the national standard. when we do a medical chest X-ray in the hospital, the radiation dose is 50mmUS, which means that X-ray machines in the subway have to be scanned about 100 times in order to get the radiation dose of the chest X-ray. Therefore, pregnant moms who ride the subway every day don't need to worry.
The X-ray safety detectors used in the subway have a much lower dose of X-ray radiation than the X-ray machines used for medical diagnosis, and the radiation around the detectors is very weak. Even full-time operators do not need protection and can work safely. Subway security gates, also known as "metal detectors," work by using electromagnetic induction to detect whether passengers are carrying metal objects.
Since this is the principle, there will be a certain amount of electromagnetic radiation, but the dose of electromagnetic radiation from safety gates meets the national standard, which is lower than that of cell phones, and has a negligible effect on the human body. You can pass through a security door. No problem. The amount of radiation is too small to harm the baby. Nowadays, big cities basically have subways, and many pregnant women take the subway to work every day. Large months of security personnel to see pregnant women are generally hand check release, small months of security personnel can also directly tell you are pregnant, generally will not take the detection instrument to sweep you.