Exposures in excess of 100 mSv increase the number of cancer deaths.
In considering the effects of radiation on people, almost all the information globally is based on data from the atomic bomb survivors in Hiroshima and Nagasaki. Generally speaking, if levels do not exceed 100 mSv, it has been found that effects on cancer deaths, above the background rates, are undetectable. Internationally as well, in the field of radiation protection, it has been concluded that the effects of radiation exposures of less than 100 mSv are very small. Specific effects are miniscule, and are at a level that cannot be confirmed in epidemiological studies. In radiological examinations in routine medical practice, 100 mSv is not exceeded.