Long-term spectral stability of HgI2 gamma-ray detectors

Fred P. Vaccaro; Lodewijk Van den Berg; Laurel A. Szubart; Ronald D. Vigil; Raymond P. DeVito; Craig Johnson

doi:10.1117/12.450747

18 December 2001 Long-term spectral stability of HgI₂ gamma-ray detectors

Fred P. Vaccaro, Lodewijk Van den Berg, Laurel A. Szubart, Ronald D. Vigil, Raymond P. DeVito, Craig Johnson

Proceedings Volume 4507, Hard X-Ray and Gamma-Ray Detector Physics III; (2001) https://doi.org/10.1117/12.450747
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Fred P. Vaccaro, Lodewijk Van den Berg, Laurel A. Szubart, Ronald D. Vigil, Raymond P. DeVito, and Craig Johnson "Long-term spectral stability of HgI₂ gamma-ray detectors", Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); https://doi.org/10.1117/12.450747

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