When in doubt if the information in the website is reliable, use this Library checklist.
The U.S. National Library of Medicine also has a page on Evaluating Internet Health Information.
Radioactivity -- Different radioactivity topic pages with associated quizzes
World Health Organization - Ionizing Radiation -- A wide range of information material from the WHO.
X-Ray Risk - Sponsored by ASRT. Awareness about having too much radiation exposure from diagnostic tests.
Clinical Trials Network's mission is to facilitate the effective use of molecular imaging biomarkers in clinical trials.
AuntMinnie.com is a community site for radiologists and related professionals in the medical imaging industry, including news and information about medical imaging written by individuals who are executives, editors, and software engineers with years of experience in the radiology industry.
Fact Sheets from Society of Nuclear Medicine and Molecular Imaging (SNMMI) -- Patient and professional information is provided on various nuclear medicine and molecular imaging topics.
Includes a section on Nuclear Medicine and Diagnostic Imaging.
"The Human Heath Campus is designed to serve as an informative resource for health professionals, working in Medical Physics, Nuclear Medicine, Radiology, Radiation Oncology, and Nutrition, providing insight into different aspects of modern clinical practice."
Health videos for patient education on topics such as human anatomy, surgical procedures and health news.
Radiopaedia.org is a free educational radiology resource with one of the web's largest collections of radiology cases and reference articles.