Yes, if it's a human x-ray. Since it accelerates aging (see radiation aging and the absence of a minimum dose), reduces immunity, increases the likelihood of cancer (see causes of malignant neoplasms, chemical, biological, physical ...), increases the likelihood of deformities in offspring. (See list of teratogens with a proven effect ).
Not if it's an X-ray of food in a bag, or a ringing metal detector.
The most severe consequences of exposure to a scanner are usually associated with Articles 188 (smuggling), 228 (illegal drug trafficking), 222 (illegal transportation of weapons), 263 (threat to flight safety) of the Criminal Code of the Russian Federation.
Oh, and one more thing: the girl behind the monitor will see your real tactical and technical characteristics.
Otherwise, it is no more dangerous than being in Red Square without lead panties, where the basalt and granite of the Mausoleum fonit very well.
If you ask the authorities this question, they will tell you that such scanners are absolutely safe. In fact, of course, this is not the case. There is a concept of non-threshold radiation exposure. Even the smallest radiation exposure can have dramatic consequences.
It all depends on the condition of your body. If you are low on heavy metals in your body, radiation may not have any effect. Some of the cells will die, of course, but that's the end of it.
But if it so happens that you have heavy metals in your body, then everything can end quite sadly. As a result of irradiation, the molecules of these metals will become radioactive and begin to kill the cells around them. Instead of killed cells, new ones will grow due to division. But these new ones will already be of worse quality than the old ones. And when the number of divisions approaches fifty, the new cells may be cancerous. The mechanism of restraining fission will be violated in them. As a result, you will get a tumor, possibly malignant.
But all this will not happen immediately. And when a tumor develops, it will be impossible to prove that the cause was the radiation at the airport. Or in the hospital, when you did an X-ray.
And the presence of heavy metals in the body depends mainly on nutrition, on the quality of water, on the quality of the environment. In certain cases, heavy metals are removed from the body, sometimes they accumulate. Lead a healthy lifestyle, and then no scanners will harm you.