Akademik Veri Yönetim Sistemi
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, cilt.689, ss.7-11, 2012 (SCI-Expanded)
A 35 x 3.5 x 4.6 mm(3) thick TlBr detector with pixellated Au/Cr anodes made by Radiation Monitoring Devices Inc. was studied. The detector has a planar cathode and nine anode pixels surrounded by a guard ring. The pixel pitch is 1.0 mm. Digital pulse waveforms of preamplifier outputs were recorded using a multi-channel GaGe PCI digitizer board. Several experiments were carried out at -20 degrees C, with the detector under bias for over a month. An energy resolution of 1.7% FWHM at 662 key was measured without any correction at -2400 V bias. Holes generated at all depths can be collected by the cathode at -2400 V bias which made depth correction using the cathode-to-anode ratio technique difficult since both charge carriers contribute to the signal. An energy resolution of 5.1% FWHM at 662 keV was obtained from the best pixel electrode without depth correction at +1000V bias. In this positive bias case, the pixel electrode was actually collecting holes. A hole mobility-lifetime of 0.95 x 10(-4) cm(2)/V has been estimated from measurement data. (C) 2012 Elsevier B.V. All rights reserved.