Doctors who have been exposed to radiation will carry a radiation card to measure their own radiation. Once it exceeds the standard, it is necessary to trace the cause and prevent it. So it is technically safe. However, in reality, many elderly orthopedic surgeons and interventional doctors often sacrifice their own bodies to operate in the radiation area in order to pursue the best results of patients. I often wear lead clothes weighing dozens of pounds for surgery myself. Although important parts are protected, many places will still be exposed to radiation. So there are still many old professors who eventually died of skin cancer or other cancers. The maximum radiation that a person can accept every year is 2.4 millisieverts.
Therefore, as long as you do CT, the amount of radiation must exceed the limit, and it is far beyond the limit. However, as long as it doesn't add up, there is no problem. In five years, the average level of the remaining four years is no more than 2 millisieverts, which has no harm to health. When it comes to biological macromolecules, the most important thing is DNA. Ionizing radiation can break single and double strands and damage bases in DNA, and lose its complete structure, which leads to the failure of DNA replication and transcription, further causing cell mitosis delay, chromosome aberration, and even cancer (infinite proliferation of division).
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