What are the recommended annual dose limits for radiation exposure?
Annual dose limits for radiation exposure are established by the NRC in the Code of Federal Regulations  . Radiation workers may not receive more than 50 mSv per year to the whole body or 500 mSv to an individual organ or to the skin. A lower annual limit of 150 mSv is prescribed for the lens of the eye, because of the increased risk of cataracts. Radiation workers are required to wear thermoluminescent dosimeters (typically embedded within badges or rings) so that their exposure can be monitored. Radiation workers who exceed annual limits will be prevented from continuing in their occupations for the rest of the year if they exceed the annual limit. Members of the general public are limited to 1 mSv per year. In the United States, this does not apply to individuals who are exposed to ionizing radiation from medical imaging, and at present there are no limits on the annual exposure of an individual patient. However, many European countries have established diagnostic reference levels (DRLs), which provide recommended limits on radiation dose indices for diagnostic and interventional radiology examinations as well as nuclear medicine studies.