Book excerpt: Nuclides.net describes an integrated environment for computations on radionuclides and their radiation. In addition to providing the necessary background on radionuclides and radiation, the accompanying CD-ROM, for Microsoft Windows operating systems, offers extensive information on the physics and radiology of familiar nuclides. Through an electronic nuclide chart, the user can access codes, via the Internet, for a number of applications which allow the required data to be computed quickly and reliably by means of interactive user guidance. Nuclides.net can be used for teaching, research, and for practical applications.