Do an X-ray chest radiation dose in zero point zero a few mSv, are within the safe range. Because our country or international regulations to do an X-ray radiation dose of the safe range is less than 20mSv, zero point zero a few mSv is absolutely safe, so there will be no impact. Because the human body in the conventional nature will also be exposed to a variety of radiation, such as a long-distance flight, from China to the United States exposure to radiation dose, may be greater than the radiation dose of an X-ray, so an X-ray is certainly safe, is absolutely within the safe range. X-rays are first used for chest x-rays, which are widely used, and now most medical examinations are still done with chest x-rays. Another feature of X-rays is in the bone and joint, to view fractures in this area, to determine whether there is a fracture after trauma. X-rays are also preferred for diseases of the skeletal system, such as skeletal tumors, and are now called DR or digital imaging. x-rays have an advantage in determining fractures, such as obvious fractures, which can be diagnosed as fractures by looking at the displacement and surrounding conditions. This includes the review of the fracture after treatment. The other aspect is to check the bone tumor, that is, to check the patient’s osteogenic response, the presence of osteogenesis and the presence of necrotic bone, which are also very helpful for the qualitative diagnosis of bone diseases.