Abstract
Having a high atomic number (TI: 81, Br: 35), high density (7.56 g/cm3), and wide band gap (2.68 eV), thalliumbromide is a favorable candidate material for room-temperature semiconductor gamma-ray detectors. Previous work has shown that TlBr detectors with thicknesses of 5 mm can achieve as good as 1 % FWHM energy resolution at 662 keV. In this work, we report on the spectroscopic performance and charge transport properties of thirteen 5-mm-thick TlBr detectors. Experimental results show that it is feasible to construct operational TlBr detectors with 5 mm thicknesses that acheive energy resolution close to 1 % FWHM at 662 keV. However, consistency in device performance remains an issue with the worst detector preforming at 4.5% FWHM at 662 keV.
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