Decreasing the Minimum Detectable Level of an advanced spectroscopic portal by using multiple detector approach

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.