Chest x-ray radiation is exceptionally small and within the medically permissible range. In daily life, more or less will be radiated, the amount of radiation for each person in a year is about 3 millisieverts or so, in the X-ray examination, only 0.01 millisieverts or so, so this radiation is relatively small, and nowadays the machine is also slowly upgraded, so the chest film x-ray radiation is particularly small. The main use of the chest film is to observe rib fractures, inflammation, tuberculosis, abscesses, tumors, etc. Through the x-ray film can also see whether the patient’s heart has a disease, so the use of X-ray chest film is very wide, often used for physical examination, not only is it more convenient to check, but also the harm to the human body is very small. Do chest x-ray must be done under the guidance of a doctor to avoid adverse reactions, pregnant women are contraindicated.