A multi-element scintillation detector, consisting of eight NaI(Tl)/BGO scintillators surrounding a single NaI(Tl)/CsI(Tl) scintillator, was initially developed for locating and measuring concealed special nuclear materials that emit primarily low energy photons. Signal digitizers and LabView virtual instrument (VI) subroutines process and analyze pulses from each of the dual scintillators to suppress Compton interactions occurring in the central detector and discriminate between low and high energy photon events occurring within NaI(Tl) and CsI(Tl) crystals, respectively. Digital signal processing significantly improved the signal-to-noise ratio of the central detector and greatly reduced the analog electronic equipment required in the same time.