Societies / Organizations
   
HPS 
Health Physics Society		 http://www.hps.org  
AAPM 
American Association of  Physicists in Medicine		 http://www.aapm.org
RSTI 
Radiological Service Training Institute		 http://www.rsti-training.com
IOMP 
International Organization of Medical Physicists		 http://www.iomp.org
IAEA 
International Atomic Energy Agency		 http://www.iaea.org
RSNA 
Radiological Society of North America		 http://www.rsna.org
ACR 
American College Radiology		 http://www.acr.org
CRCPD 
Conference Radiation Control Program Directors 		 http://www.crcpd.org
CDRH 
Center for Devices & Radiological Health 		 http://www.fda.gov/cdrh/index.html
ACMP 
American College of Medical Physics 		 http://www.acmp.org
NCRP  
National Council on Radiation Protection  
and Measurements   		 http://www.ncrp.com/info.html

DITEC
Diagnostic Imaging Technical Education Center

 http://www.ditecnet.com