How much exposure to X-rays can harm the body?

Rephrase: Can taking X-rays hurt your body or not? Usually go to the hospital to take X-rays, few people think of asking the hospital to provide protective equipment for themselves. And a few days ago a foreign teacher from the UK in Zhengzhou questioned the matter. Although some doctors believe that occasional exposure to X-rays will not cause physical harm, but some experts also believe that this potential harm may also threaten human health ----- News event A foreign language school teacher in Zhengzhou from London, England, John, not long ago, suddenly felt tightness in the chest, and coughing more than to Zhengzhou city. A famous medical treatment. According to the doctor's advice, he needs to first go to the radiology department for chest X-ray examination. Came to the door of the radiology department, John was very surprised. Do chest X-ray of many people, the doctor let each group of 10 people at the same time into the machine room, one by one on the machine check. John immediately protested this and accused the hospital of violating the relevant regulations. The hospital ignored his comments, and he could not afford not to have his condition examined, so he had to wait at the end of the line and ask the doctor to examine him alone. Finally, John walked into the machine room alone. Just as the doctor began to examine him, he asked the doctor to shield his thyroid, eyes, gonads, etc., and told the doctor that he "wasn't here to take an X-ray bath". However, the doctor told him: "The hospital does not have any protective equipment for the examinee, only the doctor has it. One or two exposures (to X-rays) will not cause any physical harm." After a 30-minute standoff, John had to give up the examination and leave the hospital unhappy. He hoped to have an X-ray examination with shielding protection in other hospitals. However, he ran through many hospitals in Zhengzhou City, were unable to do so. June 23, John wrote to the local media, said: "In our country (Britain) to do X-ray examination, there are special people to inform the examinee of the hazards of X-rays on the body, the examination must be strict, meticulous protection. Your country's Ministry of Health also has strict regulations, why don't they (hospitals) go and enforce them?" Irradiation of the status quo John more serious child incident spread in the community, many people feel that they used to do X-ray examination, never thought of shielding protection. Doctors never warned about it either. Let a person feel to do X-ray examination, is that way: the examinee stood in front of the instrument, the doctor sat behind the glass screen, the machine moves around to shine a few minutes on the OK! After the incident, the local media in Zhengzhou City, seven hospitals for unannounced visits, found that there is not even a hospital on the examinee to do chest X-ray when any protective measures. In the First Affiliated Hospital of Henan Provincial College of Traditional Chinese Medicine, a mother brought her son for an X-ray examination and was asked to enter the machine room with her son for care. When the door to the machine room closed, he asked the doctor, "Why do you have to hide next to the glass for the examination, are you doctors afraid of irradiation? Am I not afraid?" The doctor said, "You're fine, just once, there will be no harm to the body." In the Henan Provincial People's Hospital, the reporter asked "If someone asks for protection in accordance with national regulations for radiological examinations, the hospital is able to provide protective equipment?" A radiologist simply replied: "If the patient has such a demanding request, I will say: Sorry, we do not have this condition, can not meet your requirements." A doctor from the radiology department of the First Affiliated Hospital of Zhengzhou University, on the other hand, said, "It's true that we don't take any protective measures for patients here. But I believe that there will not be any hospital in the whole of Zhengzhou, to take protective measures for patients." Hospitals are such a status quo, the patient's level of awareness is not high! Reporters in the First Affiliated Hospital of Zhengzhou University on the 12 examinees to conduct random interviews found that 11 of them have never heard of the state has shielding protection regulations, and never in a similar examination of the protection. Only one college student examined said, "I know that X-rays are harmful, but only irradiated once, it should be fine." Expert discernment X-rays are a kind of ray invisible to the human eye and cannot be felt, it can penetrate the human body and general objects, even metal products. Currently widely used CT diagnostic technology (computerized X-ray body radiography), chest X-ray, etc., all belong to However, the reality is that, on the one hand, hospitals in the X-ray examination is never shielded protection for patients; on the other hand, the public rarely realize the need for shielding protection. "If it wasn't for that Englishman John's seriousness, we'd all be used to it." One of the reporter's friends said, "Because that's the way we've never been." John said, "Doctors should know more about the dangers of radiation than the person being examined, and even being x-rayed for a few seconds can cause potentially serious lesions to the body." So how harmful are X-ray examinations under non-screened conditions? Ray protection expert Professor Wu Yi published the view that: X-rays in the penetration of the human body, will produce mild harm to the human body, caused by the human body biological macromolecules and water molecules ionization and excitation reaction, resulting in harmful effects, without any protection of the irradiation of the human body will cause damage to the ray. Wu Yi clearly pointed out in his article that the harm suffered by the examinee, including the induction of cancer, hereditary diseases, infants and children with reduced intelligence. Dr. Ma Jun, an associate professor at the Second Affiliated Hospital of Zhengzhou University, told reporters, "The vast majority of the damage caused by rays to the human body will lurk in the body for a long time, destroying the immune system." A doctor once encountered a patient after a routine X-ray examination, diarrhea, but also severe dizziness, white blood cells plummeted to less than 2,000 per cubic millimeter, less than half the normal. He said, "Patients who are so sensitive to radiation are not many in the clinic, but the potential harm is there for everyone."