\”Beijing Hospital Safety Order Management Regulations\” will be implemented from July 1, and Beijing medical institutions have successively installed Security check system. However, while improving the sense of security in medical treatment, some pregnant mothers who go to the hospital for examination are also worried: Will the radiation from the security gate and security inspection equipment affect the health of themselves and the baby in their belly? In this regard, experts have made it clear that there is no need to worry. Whether it is a security gate for \”passing people\” or a security inspection device for \”passing objects\”, the radiation dose to the human body is very small, especially the radiation dose of the security inspection device is not as good as that of a mobile phone.
Zhao Chonghui, chief designer of the 25th Institute of the Second Academy of China Aerospace Science and Industry Corporation, told reporters that the country has clear standards for the radiation dose of various types of electromagnetic equipment. Security inspection equipment from regular manufacturers can fully meet the national radiation standards. Zhao Chonghui said that the greater the power of the device, the greater the intensity of electromagnetic radiation. Taking the millimeter wave security detector they successfully developed as an example, the power is less than 0.1 watts, while the maximum power of mobile phones can reach 2 watts during a call. The power of security checkers is less than 1/20 of that of mobile phones, and the intensity of citizens using security checkers is much less than that of mobile phones. The distance when passing through security checkers is also much greater than the contact distance with mobile phones, so there is no need to worry about the electromagnetic radiation of security checkers. Affect health.
Zhao Chonghui introduced that the principle of ordinary security gates is to use changes in magnetic flux in the electromagnetic field to achieve detection results. That is to say, when a person carries a certain amount of metal through the security gate At this time, the metal it carries cuts the magnetic lines, causing the uniform magnetic field in the security door to change, thus issuing an alarm prompt. If the magnetic flux increases and the signal during the acquisition process is greater than the set value, the central processor causes the alarm system to send an alarm signal. On the contrary, if the uniform magnetic field in the security door does not change and the magnetic flux does not increase, no alarm signal will be sent.
The new millimeter wave security detector can convert the detected object information into a grayscale image display, using the object\’s own scatteringDifferent characteristics of radiation characteristics and radiation characteristics can distinguish different items from the image. Although the technology is more advanced, the amount of electromagnetic radiation between the two is not much different, and the impact on human health is very subtle.
Reporters learned from the manufacturer of the They are all made of lead walls, so under normal circumstances, they can effectively block X-rays from entering the external environment. Moreover, during use, only when luggage items pass through the X-ray security inspection machine, the machine will emit rays for detection, and then undergo computer processing to display an identifiable image on the computer screen.
Experts from the School of Public Health, Peking University Health Science Center, said that the radiation dose of X-rays from security inspection machines is also very low, only about 1% of that of hospital X-ray diagnostic machines. %. Even if a person enters the security checker, the radiation dose received each time he passes through the security checker is far below the annual average effective dose limit for the public in the \”Basic Standards for Ionizing Radiation Protection and Radiation Source Safety\”. What\’s more, what enters the security scanner is an object, and people just pass quickly by it, so the amount of radiation is extremely small. Therefore, if pregnant mothers go through the bag security check normally, it will not affect the health of themselves and the baby in their belly.
Source: Beijing Daily Client | Reporter Zhang Hang Jia Xiaohong
Editor: Cai Wenqing
Process Editor: Guo Dan
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