X-rays disappear immediately after irradiation and do not remain in the body, but only interact with the body’s cells, tissues, body fluids and other substances during the irradiation process, thus destroying the cellular structure in the body. However, the degree of damage is related to the dose of X-rays, and only when the dose reaches a certain level will acute radiation damage occur. However, the dose used in normal examinations is controlled within the national safety limits, such as ordinary chest X-ray, the amount of radiation is only 0.1mSv, which is a little higher than the natural background radiation, so the radiation is basically negligible. As long as the patient is not continuously irradiated for several times, the damage to the body is very small, so there is no need to worry too much.