Will there be electromagnetic radiation residue when taking food through subway security check?
At present, general security inspection equipment can be divided into three types: X-ray security inspection equipment, hand-held metal detectors and security doors. Among them, the most puzzling is the "X-ray security equipment".
Although the baggage X-ray security inspection instrument, like the medical X-ray diagnostic instrument, obtains the internal image of the object by irradiating the object with X-rays, its radiation dose is far less than that of the medical X-ray diagnostic instrument, because the security inspection image does not need to reach the resolution of medical diagnosis level, and only needs to judge whether to carry dangerous goods.
According to the national standard GB 15208. 1-2005 "Micro-dose X-ray Safety Inspection Equipment Part 1: General Technical Requirements" promulgated and implemented in 2005, the single inspection dose used by X-ray security inspection equipment should be less than 5μGy (micro-Gy, the dose absorbed by the inspected object), which is also the current X-ray baggage security inspection. The radiation dose of X-ray security devices used in subways and airports is far below the above standards. Because the radiation of the baggage X-ray security device is very small, the impact on the scanned item itself can be ignored.
In addition, unlike radioactive element particles, X-ray scanning will not cause radioactive pollution. After scanning, no radioactive substances will remain on the luggage, and the food scanned by X-ray will not cause harm to human health.
Therefore, we don't have to worry about electromagnetic radiation residue when we take food through the subway security check, as long as we can safely pass the security check, but we still have to avoid taking some prohibited items and abide by the rules of taking the subway.
I hope this answer is helpful to you.