The combination of sperm and egg will result in the formation of a fertilized egg, which will form an embryo after it has been laid. However, there is a possibility that the sperm or egg may develop abnormalities, chromosomal karyotypes or genetic mutations after X-ray exposure, and even if a fertilized egg is formed after the union of sperm and egg, there may be symptoms of miscarriage. In addition, a sufficient dose of X-ray radiation may cause embryo failure. Therefore, it is important to avoid exposure to radiation after the fertilized egg is laid. Like X-ray, chest X-ray, CT irradiation, all are radiation and sufficient dose of radiation can cause embryonic dysplasia, therefore, it is important to avoid exposure to radioactive substances both during the preparation period and in the early stage of pregnancy.