Yale University
Yale New Haven Teachers Institute: Nuclear Medicine
An extensive overview of nuclear medicine and its history. Description of radiopharmaceuticals, imaging techniques, and diagnostic/therapeutic procedures.
Other
World Nuclear Association: Radioisotopes in Medicine
The use of radioisotopes in medicine is discussed, focusing on diagnostic and therapeutic radiopharmaceuticals. Includes a list of radioisotopes used in medicine.
Lawrence Berkeley National Laboratory
Berkeley Lab: Radioactivity in the Natural Environment
Charts take a look at radioactive nuclei found naturally on Earth.
US Environmental Protection Agency
Epa: List of Drinking Water Contaminants
Table outlines the EPA's standards for safe drinking water, defining levels of contaminants and listing possible sources of these contaminants.