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This work summarizes a continuous study of the Silicon Photomultiplier (SiPM) device photo-coupled to various scintillation crystals for profound investigation in the radiation detection and isotope identification research field. Radiological and electrical measurements which have been carried out led to an obvious illation regarding the optimal scintillation crystal to use with SiPM. CsI(Tl) was selected as the most appropriate and further, more intense, tests were performed, among them temperature stability and the obtained energy resolution.

This work introduces a new approach for designing an Advanced Spectroscopic Portal (ASP). The new design is based on multiple, small (7.62 cm x 7.62 cm) and commercially available NaI(Tl) scintillation detectors. A comparison to another approach, which employs very large detectors, is presented in the aspects of source localization, signal to noise ratio (SNR), and identification and detection performances. The advantages of the introduced approach are discussed. In addition, a mathematical model applied within Rotem’s ASP, Radiation Material Detection System (RMDS), for improving the Minimum Detectable Level (MDL) is described. This algorithm shows explicitly the advantage in usage of multiple detector modules over few larger having the same scintillator type and volume.