Based on these studies, the U.S. Food and Drug Administration (FDA) estimates that exposure to 10 mSv from an imaging test would increase the risk of death from cancer by approximately 1 chance in 2000. It can be difficult to study cancer risks from imaging studies that use radiation. There is a public misconception regarding the relationship between radiation and cancer.
This is the belief that any amount of radiation can cause cancer. This radiophobia is not justified, since the real risk of radiation-induced cancer is very low. A very large amount of radiation is needed to cause cancer. The associations between exposure to ionizing radiation and the development of cancer are mainly based on the LSS cohort of Japanese atomic bomb survivors, the largest human population ever exposed to high levels of ionizing radiation.