Accurate Determination of the Ionization Energy in Pixelated TlBr Correcting for Charge Collection Efficiency

Thallium-bromide (TlBr) is currently under investigation for use as an alternative room-temperature semiconductor gamma-ray spectrometer. Performance of better than 1% full-width at half maximum at 662 keV can be achieved when TlBr detectors are cooled to -20 °C. The theoretical limit of energy resolution is determined by the ionization energy in semiconductor detectors, and accurately measuring i...