Abstract: Disclosed is a mobile and miniature radionuclide detection and identification system that has a processor and a quasi-hemispherical cadmium zinc telluride (CZT) component. The processor and the storage medium are surrounded by a housing and the storage medium contains a library of radionuclides. A graphic user interface is integral to the surface of the housing and the graphic user interface includes a touch sensitive display. In order to detect a radionuclide, the CZT component sends a signal to the processor, which then queries the library of radionuclides to identify a possible radionuclide.