At present, the city implements the normal security screening of subways. Some people worry that the X-ray screening instrument 's radiation is harmful to the human body, saying that "every day is radiated once, people's lives should be short one day." For this reason, some passengers even refuse security screening. So, does the amount of radiation from security devices really affect health?
The baggage X-ray security instrument and the medical X-ray diagnostic instrument use the X-ray to illuminate the object to obtain the internal image of the object. However, the radiation dose of the package security instrument is much smaller than that of the medical X-ray diagnosis because the image of the security package is wrapped. It does not need to reach the medical diagnostic level of resolution. According to the national standard GB15208.1-2005, the X-ray security instrument's single inspection dose should not exceed 5μGy, and the X-ray dose should be less than 5μGy/h at any point 5cm away from the outer surface of the device (including the equipment inlet and outlet). This standard is the same as the FDA standard. In fact, the radiation dose of X-ray security instruments used in subways and airports is much lower than the national standards.
When the lead screen of the security instrument import and export office was opened, technicians showed the highest data on the portable radiation detector at the entrance and exit. After calculating, the technicians stated that the highest data is used as the calculation standard. If a passenger takes the subway every day for 365 days a year, he will pull up the lead curtain every time he passes the security check. Each time he pulls up for 5 seconds, then The annual effective dose of radiation received by the passenger is less than 0.007 mSv.
According to the national "Basic Standards for Ionizing Radiation Protection and Radiation Source Safety", the dose of radiation received by a normal person per year must not exceed 1 mSv. The standards of our country are based on the standards of the six authoritative international organizations such as the United Nations Scientific Committee on the Effects of Atomic Radiation and the International Atomic Energy Agency. Even if they are referenced worldwide, they are more stringent.
The internal rays of the security instrument are basically direct and all sealed in the security instrument. There is still a small amount of scattering in the ray, but the lead curtain of the security instrument import and export can basically block, plus all four walls inside the security instrument are thick lead wall, so long as the lead curtain is not lifted, the security instrument is detected around No radiation.
Although there are few radiation doses for security devices, it is recommended to keep them as far away from the exit as possible, or to shorten the residence time at the exit. Wait until the goods pass through the curtain and the curtain hangs down completely before taking luggage.
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