The traditional measure of radioactivity based on the observed decay rate of 1 gram of radium. One curie of radioactive material will have 37 billion disintegrations in 1 second. For more information, See "Primer on Radiation Measurement" from CDC
U.S. Department of Health and Human Services, Office of the Assisstant Secretary for Preparedness and Response, National Library of Medison, Radiation Emergency Medical Management (REMM), Dictionary of Radiation Terms, Washington, DC, USA 2014. http://www.remm.nlm.gov/dictionary.htm, (Dzstr/ Rad Emr - Amer) {822}
Centers for Disease Control and Prevention, Emergency Preparedness and Response, Radiation Emergencies, Radiation Dictionary, U.S. Department of Health and Human Services, Atlanta, GA, USA 2011. http://emergency.cdc.gov/radiation/glossary.asp, (Dzstr/ Rad Emr - Amer) {820}
Centers for Disease Control and Prevention (CDCP), Emergency Preparedness and Response, Glossary of Radiological Terms, Atlanta,GA, USA 2004. http://www.floridadisaster.org/Preparedness/Techno logicalHazards/Radiological/documents/ radiation%20emergency%20glossary%20(CDC).pdf, (DPrep - Amer) {1012}