Many people in Brazil, Sudan, India, Iran and China exceed the maximum yearly dose for US Civilians based on Natural Background Radiation | NextBigFuture.com
What Is Background Radiation? Sources and Risks
Natural background radiation - Canadian Nuclear Safety Commission
Canadian Nuclear Safety Commission (CNSC) - Radiation doses explained: To protect your health, we set the radiation dose limit at 1 millisievert (mSv) per year for members of the public. This limit
Ionizing Radiation - Background | Occupational Safety and Health Administration
Ionizing Radiation
Sources and distribution of average radiation exposure to the world... | Download Scientific Diagram
Personal Annual Radiation Dose Calculator | NRC.gov
Average annual effective dose per person received in 1980 (left panel)... | Download Scientific Diagram
Digital Atlas
Exposure Dose from Natural and Artificial Radiation [MOE]
Radiation Sources and Doses | Radiation Protection | US EPA