Efficiency calibration and coincidence summing correction for a large volume (946cm3) LaBr3(Ce) detector: GEANT4 simulations and experimental measurements.

The paper describes the studies on efficiency calibration and coincidence summing correction for a 3.5″×6″ cylindrical LaBr3(Ce)detector. GEANT4 simulations were made with point sources, namely, 60Co, 94Nb, 24Na, 46Sc and 22Na. The simulated efficiencies, extracted using 60Co, 94Nb, 24Na and 46Sc that emit coincident gamma rays with same decay intensities, were corrected for coincidence summing by applying the method proposed by Vidmar et al. (2003). The method was applied, for the first time, for correcting the simulated efficiencies extracted using 22Na that emits coincident gamma rays with different decay intensities. The measured results obtained using 60Co and 22Na were found to be in good agreement with simulated results.