U.S. Environmental Protection Agency Office of Radiation Protection Programs Home Page, Health Effects. http://www.epa.gov/rpdweb00/understand/health_effects.html (Accessed on November 10, 2014).

U.S. Environmental Protection Agency Office of Radiation Protection Programs Home Page, Health Effects. http://www.epa.gov/rpdweb00/understand/health_effects.html
(Accessed on November 10, 2014).