1. Are food items scanned by security inspection equipment hazardous?

        The radiation of an object mainly depends on its own content and ingredients. Vegetables and other food materials will not remain due to X-ray exposure, not to mention cumulative damage. Therefore, everyone does not need to worry about the radiation produced by security inspections on food. Experts pointed out that although radiation devices are strong or weak and cannot be generalized, the radiation dose of security inspection equipment installed in subways, airports and some special places is controlled within the safety line.

        Our country's standards are relatively strict worldwide. Moreover, each security inspection equipment must be verified by the environmental protection department before use and must be within the scope of national standards, which is usually far lower than the individual tolerance limit. Therefore, everyone can eat the food that has passed the security inspection without worrying about it being too dry!

2. What can security inspection equipment detect?

        The security inspection equipment used in the subway is mainly X-ray security inspection equipment. When it is wrapped in the conveyor belt, the image scanned by X-ray will appear on the display screen connected to the equipment. Identify crew members by observing if passengers carry packages with contraband in pictures, color blocks. The imaging rules of the X-ray machine are the resolution of the shape interval of the viewpoint resolution, the density of the brightness, and the color of the structure. We determine whether there are dangerous goods by determining the shape and color of the image. During this time, the colors are mainly orange, green, blue, and red.

        Orange is the color of organic matter, more common items include explosives, drugs, plastics, paper, cloth, wood, and water; green is the color of mixtures, more common items include aluminum sheets, circuit boards, etc.; blue is inorganic to show color, More common items include industrial equipment, tools, metal materials, etc.; for radio damaged objects, it is also red for dry or dense objects, metal plates or lead plates are common X-ray security inspection equipment through the X-ray imaging inspection of objects .

        Because the materials of different objects are different, the degree of X-ray transmission is different, and the color of the image formed is also different. On the computer screen of the security inspection equipment, metal knives, simulated guns, daggers and other metal objects are displayed in dark blue or black; hair spray, lighters are flammable and explosive materials, the outer can is blue and the middle is green; backpacks, mineral water, etc. Non-prohibited items are orange. Security inspection equipment mainly checks luggage bags through colors and switches. Most contraband will appear in red, green, black, or dark blue, so you must make a comprehensive judgment on the appearance. The accumulation of professional knowledge and experience is also very important.