Reversible capacitive Frisch grid TlBr detectors

Abstract

A reversible capacitive Frisch grid detector was fabricated using a thallium bromide (TlBr) crystal with a symmetrical electrode design. The device operates by switching the polarity of the applied voltage, which is necessary for a stable TlBr detector operation. A 2 mm × 2 mm × 5 mm bar-shaped TlBr crystal was used to construct the detector, which exhibited an (full width at half maximum) energy resolution of 1.9 % for 662-keV γ-rays measured using a depth correction method at room temperature. The TlBr detector also showed a stable operation for 8 h of with hourly bias switching.