Abstract
Gamma-ray spectrometers using mercuric iodide (HgI 2) photodetectors (PDs) combined with scintillators have been designed, fabricated and tested. The technology developed makes it possible to reliably produce high quality HgI 2 PDs with a relatively high yield. The energy resolution of 4.58% FWHM for 662 keV 137Cs gamma-ray photons has been obtained. The HgI 2 PD configuration, packaging and encapsulation is described in the paper. After successfully developing the technology for making high quality detectors, the emphasis of our effort has been placed on making large area detectors, i.e., increasing detector diameters from 0.5 in. to between 1 and 2 in. HgI 2 PD characteristics, which include energy resolution, electronic noise, leakage current, detector capacitance, and long term stability have been evaluated and are reported in the paper.
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