Measurements of high-energy γγ-rays with LaBr3:CeLaBr3:Ce detectors

The full-energy peak efficiency calibration and the energy resolution measurements of the 2in.×2in.LaBr3LaBr3γγ-ray detector are presented for γγ-ray energies in the 700 keV–17.6 MeV range. Measurements were done using a combination of proton-capture nuclear reactions on Al27, Na23, K39, Li7 and B11 for high-energy γγ-rays, and radioactive sources such as Co60 and Eu152 for the lowest energies. At high energies, two γγ-rays in a cascade from proton resonance capture were employed using Al, Na2WO4Na2WO4, K2SO4K2SO4 and LiBO2LiBO2 targets. The obtained results were compared to the simulations performed using a GEANT4 code.