Generally the ionizing radiation caused by a single CT can be eliminated after about 36 hours, and the elimination time of radiation from a CT examination in the body is related to a number of factors. CT radiation is a type of ionizing radiation, and when the body is exposed to ionizing radiation, it can cause some damage to the body’s tissues. When leaving the environment of ionizing radiation, the damage to the body is gradually repaired. However, the repair time and effect of repair are related to a variety of factors, such as the condition of the individual’s physical function, the type of CT examination, and the time of the examination. If one’s physical function is better, the repair time of the damage will be faster, and if one’s physical condition is poor, the repair time will be slower. In addition, enhanced CT radiation is significantly higher than ordinary CT, the longer the examination time, the more radiation the body receives, the repair time will also be extended, general CT radiation can be eliminated in about 36 hours at a time, depending on the specific conditions decided.