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Detector optimization for hand-held CsI(Tl)/HgI2 gamma-ray scintillation spectrometer applications

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5 Author(s)
Wang, Y.J. ; Xsirius Inc., Camarillo, CA, USA ; Patt, B.E. ; Iwanczyk, J.S. ; Cherry, S.R.
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Gamma-ray spectrometers using mercuric iodide (HgI2) photodetectors (PDs) coupled with CsI(Tl) scintillators have shown excellent energy resolutions and high detection efficiency at room temperature. Additionally HgI2 semiconductor PDs allow for extreme miniaturization of the detector packaging compared with photomultiplier tube (PMT) based detectors. These advantages make possible the construction of a new generation of hand-held gamma-ray spectrometers. Studies of detector optimization for this application have been undertaken. Several contact materials including hydrogel and semi-transparent metal films have been evaluated and compared for their performances and long term stability. In order to provide higher gamma-ray detection efficiency (i.e. larger scintillator volume), but without causing significant degradation of the excellent response achieved with the matched scintillator/PD interface, the scintillator/PD configuration has been studied. A Monte Carlo simulation model has been developed so that the spectral shape can be predicted for various scintillator shapes and surface treatments

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Nuclear Science, IEEE Transactions on  (Volume:43 ,  Issue: 3 )