Nowadays,it is indispensable for people to be exposed to security checks during their travels.From near to subway,from far to train and plane,we can see the presence of security personnel.So,have you ever wondered how the x-ray machine knows what's in the suitcase?

It actually uses the characteristic that X-rays can penetrate objects to work.X-rays are electromagnetic waves with very short wavelengths.Go to the hospital to take an X-ray.The doctor uses an X-ray.Through the X-ray,it is easy to see the shape of the bones and find abnormalities in the bones in the body.X-rays have a high penetration rate in a loose structure,but low penetration rate in a dense structure.The bones of the human body are denser than the surrounding tissues,so when X-rays irradiate the human body,they will show the outline of the bones.

Similarly,for security scanning machines,the penetrating ability of x-rays varies from object to object.When the suitcase passes through the security inspection machine,the x-ray penetrates the suitcase and shows the contours of different objects on the screen.Then,based on the color,it can further determine which category the object belongs to.Although there will be a small amount of X-ray radiation on the security inspection machine,there will be an X-ray protective curtain at the entrance of the passage for protection,so as long as you don't open the protective curtain to take things,there is no problem.

The result of X-ray irradiation will be displayed on the film,but the image is black and white.Only by calculating the transmission intensity of the X-ray and converting the pattern on the security inspection machine into color can the security inspectors distinguish different objects.For example,in general,orange represents organic matter,liquid,spray,etc.Blue represents metal,and various control tools display blue on the screen.Black is an object that is completely absorbed by x-rays,such as heavy metals or lead.

The above is the working principle of X-ray security inspection machine shared by Yongjian.Here,Yongjian emphasizes to everyone,that is,do not open the X-ray protective curtain frequently to take luggage.If it is for a long time,it will be good for our health.There is still a certain impact.