Professional Societies

• American Association of Physicists in Medicine (AAPM)
• American College of Radiology (ACR)
• American Nuclear Society (ANS)
• Health Physics Society (HPS)
• Radiation Research Society (RRS)

Federal Agencies

• Department of Energy (DOE)
• Department of Homeland Security (DHS)
• Environmental Protection Agency (EPA). See also http://www.epa.gov/radiation/
• Federal Emergency Management Institute (FEMA)
• Nuclear Regulatory Commission (NRC)

State and Local Agencies

• Purdue University Radiological and Environmental Management (REM)

• Indiana Department of Homeland Security (IDHS)

Government-Sponsored Laboratories

• Armed Forces Radiobiological Research Institute (AFRRI)
• Brookhaven National Laboratory (BNL)
• Los Alamos National Laboratory (LANL)
• National Institutes of Standard and Technology (NIST).  The Physical Reference Section of the NIST website is especially useful
• Pacific Northwest National Laboratory (PNNL)