Title :
A Study of Low-Noise Preamplifier Systems for Use with Room Temperature Mercuric Iodide (Hgi2) X-Ray Detectors
Author :
Iwanczyk, J.S. ; Dabrowski, A.J. ; Huth, G.C. ; Del Duca, A. ; Schnepple, W.
Author_Institution :
University of Southern California Medical Imaging Science Group 4676 Admiralty Way, Suite 932 Marina Del Rey, CA 90291
Abstract :
An analysis of different preamplification systems for use with room temperature mercuric iodide x-ray detectors has been performed. Resistor-, drain-, and light-feedback preamplifiers have been studied. Energy resolution values of 295 eV (FWHM) for an Fe-55 source (5.9 keV) and 225 eV (FWHM) for a pulser have been obtained with both the detector and the input FET at room temperature using a pulsed-light feedback preamplifier. Improvement in energy resolution by cooling the input FET using a small Peltier element has been discussed.
Keywords :
Circuit noise; Energy resolution; FETs; Noise generators; Preamplifiers; Pulse shaping methods; Spectroscopy; Temperature; X-ray detection; X-ray detectors;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1981.4331242
