A gated LaBr 3 (Ce) detector for border protection applications

Abstract : We report on the dedicated implementation of the blocking technique for a LaBr(Ce) detector as well as associated electronics and data acquisition system for border protection applications. The detector is meant to perform delayed -ray spectroscopy of fission fragments produced via photofission induced by a high intensity pulsed photon beam. The gating technique avoids saturation of the detection chain during irradiation. The resulting setup allows us to successfully perform delayed -ray spectroscopy starting only 30 ns after the gating operation. The measured energy resolution ranges from 5% to 6.5% at 662 keV depending on the -ray detection time after the gating operation