American Association of Physicists in Medicine - AAPM homepage with a link to the journal "Medical Physics". Resources in Medical Physics.

European Federation of Organisations in Medical Physics - The EFOMP represents more than 5000 physicists and engineers in the field of Medical Physics.

Health Physics Society - Professional organization dedicated to development, dissemination, and application of both the scientific knowledge of, and the practical means for, radiation protection.

International Radiation Protection Association - For people engaged in radiation protection activities in all parts of the world. Website includes organization information, and professional training materials on a wide range of topics in radiological protection and nuclear medicine.

International Commission on Non-Ionizing Radiation Protection - ICNIRP is an independent scientific organization, whose aims are to provide guidance and advice on the health hazards of non-ionizing radiation exposure. Provides information on publications, activities and links.