American Society of Radiologic Technologists - for professionals in radiography, radiation therapy, nuclear medicine, sonography, mammography, computed tomography, magnetic resonance, dosimetry.
British Nuclear Medicine Society - The journal, Nuclear Medicine Communications, is available here, as well as the society newsletter, awards and details about upcoming conferences.
Nuclear Medicine Research Council (NMRC) - nonprofit organization devoted to the beneficial applications of radioisotopes for the prevention, diagnosis, and treatment of disease.
Society of Nuclear Medicine - An international scientific and professional organization founded in 1954 to promote the science, technology and practical application of nuclear medicine.
Southern California Chapter - organization interested in the diagnostic, therapeutic, and investigational use of radiopharmaceuticals.