Fabrication of double-sided thallium bromide strip detectors

Double-sided strip detectors were fabricated from thallium bromide (TIBr) crystals grown by the traveling-molten zone method using zone-purified materials. The detectors had three 3.4-mm-long strips with 1-mm widths and a surrounding electrode placed orthogonally on opposite surfaces of the crystals at approximately 6.5 x 6.5 mm(2) in area and 5 mm in thickness. Excellent charge transport properties for both electrons and holes were observed from the TIBr crystals. The mobility-lifetime products for electrons and holes in the detector were measured to be similar to 3 x 10(-3) cm(2)/V and similar to 1 x 10(-3) cm(2)/V, respectively. The Cs-137 spectra corresponding to the gamma-ray interaction position were obtained from the detector. An energy resolution of 3.4% of full width at half maximum for 662-keV gamma rays was obtained from one "pixel" (an intersection of the strips) of the detector at room temperature. (C) 2016 Elsevier B.V. All rights reserved.