How much X-ray radiation accumulated in a short time will be harmful to health?

In modern medicine, X-rays are widely used in diagnosis and treatment. The chest should be X-rayed during health examination. If there are diseases in the digestive system, cardiovascular system and skeletal system, doctors often use X-rays for examination if they think it is necessary. Some people have concerns when taking X-rays: Will it harm their health?

Because X-rays have a certain killing and damaging effect on biological cells, the human body will have a certain physiological reaction after being irradiated by X-rays. After overexposure, it will also cause tissue damage, affect physiological functions, and even cause life-threatening. But proper irradiation will not affect human health. Because the dose used by medical staff for X-ray fluoroscopy and photography is very small, only within the safe dose. It irradiates the most sensitive tissues of the human body at a dose that does not cause any damage. If the total time of chest fluoroscopy is less than 12 minutes, gastrointestinal examination is less than 30 minutes, abdominal radiography is less than 20 times, and head radiography is less than 40 ~ 50 times within a few days under specified conditions, other parts may be slightly increased due to low X-ray irradiation conditions. If doctors need to repeat photography or fluoroscopy, they will also consider extending the examination interval. In particular, occasional chest x-ray, gastrointestinal examination, bone X-ray or angiography will not cause any adverse reactions. At the same time, in order to strengthen the protection, the unnecessary irradiated parts, especially the sensitive tissue parts, are covered with lead plates or lead-containing rubber to shorten the exposure time as much as possible. Therefore, doctors don't have to worry about X-rays when examining or treating us.