<p><i>Radioactive Sources: Applications and Alternative Technologies</i> assesses the status of medical, research, sterilization, and other commercial applications of radioactive sources and alternative (nonradioisotopic) technologies in the United States and internationally. Focusing on Category 1, 2, and 3 sources, this report reviews the current state of these sources by application and reviews the current state of existing technologies on the market or under development that are or could be used to replace radioisotopic technologies in those applications. <i>Radioactive Sources</i> will support existing and future activities under the National Nuclear Security Administration Office of Radiological Security program to reduce the use of high-risk radiological materials in commercial applications.</p>