Alternative Wide-Band-Gap Materials for Gamma-Ray Spectroscopy.

Alternative Wide-Band-Gap Materials for Gamma-Ray Spectroscopy;Nuclear Engineering and Radiological Sciences;Engineering;Nuclear Engineering & Radiological Sciences

Thrall, Crystal L.Pozzi, Sara A. ;

University of Michigan

关键词: Alternative Wide-Band-Gap Materials for Gamma-Ray Spectroscopy;    Nuclear Engineering and Radiological Sciences;    Engineering;    Nuclear Engineering & Radiological Sciences;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/99885/thrall_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Thallium-bromide (TlBr), mercury-sulfide (HgS), and mercury-oxide (HgO) detectors have been investigated as room-temperature or close-to-ambient-temperature operational semiconductor gamma-ray spectrometers. The three-dimensional position-sensitive single-polarity charge sensing technique, successfully used on CdZnTe gamma-rayimaging spectrometers, has been applied to 5-mm thick TlBr detectors and has resulted in energy resolutions as good as 0.73% FWHM and 0.97% FWHM at 662 keV on the best anode pixel and from all nine pixelated anodes respectively. Furthermore, three-dimensional position-sensing readout technology enabled characterization of both initial transient behavior and room-temperature failure behavior as a function of three-dimensional location within the TlBr detector material. Cathode-side alpha-particle irradiation also enabled the study of the electron drift velocity as a function of detector depth during both initial and room-temperature transient phases. This work presents the latest spectroscopic performance, characteristic initial transient behavior observed at -20 C, and room-temperature failure behavior on a number of 5-mmthick TlBr detectors manufactured by Radiation Monitoring Devices. Experimental results suggest uniform stable performance may be achieved through improved surface preparation and contact fabrication. This work also presents preliminary radiation and electronic response results for HgS and HgO detectors.