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Pulse height spectra of various sources covering X-ray and gamma ray energies from 10 keV to 6.1 MeV were measured by the first large O19×19 mm3 LaBr3:0.5% Ce3+ scintillator. The spectra are compared with that recorded with a same sized NaI:Tl+ scintillator. Excellent energy resolution pulse height spectra are obtained showing that the scaling up from a small (≈3×3×10 mm3) sized LaBr3:Ce3+ scintillator studied initially up to an ≈6 cm3 scintillator does not lead to much deterioration of resolution and light output. Special attention is devoted to the nonproportionality in the response of LaBr3:Ce3+ and related energy resolution. At high energy LaBr3:Ce3+ is far superior above NaI:Tl+ in terms of energy resolution and scintillation speed. At energies below 100 keV, NaI:Tl+ shows a better energy resolution.
Date of Publication: June 2004