Security inspection machine belongs to the main baggage security inspection equipment in subway and airport. The principle is simple, that is, using the ability of X-rays to penetrate matter. Different densities, thicknesses and compositions have different X-ray penetration abilities. X-ray machines identify objects in luggage according to their different penetrating abilities to various substances.
The X-ray power emitted by baggage security inspection machine is very low, and the radiation dose received is less than 5 microsieverts, which is far lower than the radiation dose used for irradiation sterilization and food preservation. Many foods we eat are actually irradiated, and so are other countries.
Extended data:
The introduction of the security inspection machine is as follows:
Organic materials, such as paper, clothes and various foods, usually show orange. Mixed materials and light metals, such as those containing sodium, silicon and aluminum, are usually shown in green. And iron, copper, silver, etc. Displayed in black and blue. The brightness of the above colors depends on the density and thickness of the material.
The US Food and Drug Administration and the US Department of Agriculture have approved that the following foods can be sterilized and kept fresh by irradiation, such as red meat, poultry, fresh fruits and vegetables, and grains packaged in cold storage or freezing.
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