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Proceedings Paper

Long-term spectral stability of HgI2 gamma-ray detectors
Author(s): Fred P. Vaccaro; Lodewijk Van den Berg; Laurel A. Szubart; Ronald D. Vigil; Raymond P. DeVito; Craig Johnson
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Paper Abstract

An evaluation of the spectral performance of eight planar mercuric iodide (HgI2) gamma-ray detectors under continuous bias voltage for a duration of up to 2000 hours has demonstrated the high degree of long-term stability of mercuric iodide as a radiation detector material. Spectral parameters determined in this evaluation include the %FWHM, the peak-to-valley and peak-to-background ratios, the gain stability of the full energy peak, and the preamplifier offset voltages. Isotopes with three distinct energies were used for these measurements: 137Cs (662 keV), 57Co (122 keV) and 241Am (59 keV). The spectra were analyzed and spectral parameters were generated using Robwin, a spectral analysis program developed by Constellation Technology. Robwin performs simultaneous non-linear fitting of several key elements of the spectrum, emphasizing the continuum for the entire spectrum, the photopeak response function of all lines in the spectrum, the relative intrinsic efficiency of the detector and the photopeak resolution width. These findings provide further support for the widespread use of mercuric iodide as a room temperature semiconductor radiation detector material for energy spectrometry.

Paper Details

Date Published: 18 December 2001
PDF: 11 pages
Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); doi: 10.1117/12.450747
Show Author Affiliations
Fred P. Vaccaro, Constellation Technology Corp. (United States)
Lodewijk Van den Berg, Constellation Technology Corp. (United States)
Laurel A. Szubart, Constellation Technology Corp. (United States)
Ronald D. Vigil, Constellation Technology Corp. (United States)
Raymond P. DeVito, Constellation Technology Corp. (United States)
Craig Johnson, Constellation Technology Corp. (United States)

Published in SPIE Proceedings Vol. 4507:
Hard X-Ray and Gamma-Ray Detector Physics III
Ralph B. James, Editor(s)

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