NDLI: Adaptation of Pixelated CdZnTe gamma-ray imaging technology for in situ planetary science applications

Content Provider	IEEE Xplore Digital Library
Author	Nowicki, S. Bodnarik, J. Evans, L. Namkung, M. Parsons, A. Schweitzer, J. Starr, R.
Copyright Year	2010
Description	Author affiliation: Astrochemistry Laboratory, code 691, NASA Goddard Space Flight Center, Greenbelt, MD, 20770 USA (Nowicki, S.; Bodnarik, J.; Evans, L.; Namkung, M.; Parsons, A.; Starr, R.) \|\| Laboratory for Nuclear Science, University of Connecticut, Storrs, CT, 06269 USA (Schweitzer, J.)
Abstract	It is important for planetary sciences to find a gamma-ray spectrometer that is compact, light and provides good energy resolution in an energy range that varies from ∼ 30 keV to 10 MeV. Pixelated CdZnTe detector is a good candidate for this application due to its small volume, light weight and it has demonstrated good energy resolution below ∼2–3 MeV. At higher energies, charge sharing effect becomes a problem due to the size of the pixel. In this paper, the electron cloud diameter as a function of energy has been studied using the MCNPX Monte Carlo code. In the energy range studied, the electron cloud size increases linearly with energy. The effect of charge sharing in a 2×2×1.5 $cm^{3}$ pixelated CdZnTe detector at 662 keV, 2.614 MeV and 7.631 MeV is shown. The anode is an 11 × 11 pixelated array with 1.72 mm pitch. The simulation reveals that the electron cloud size is about three times the size of the pixel pitch for an 8 MeV event. As the energy of the source increases, charge sharing effect is dominant and the charge cloud is collected by multiple pixels which reduces the spectral performance of the detector.
Starting Page	3852
Ending Page	3855
File Size	1681048
Page Count	4
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874534
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	planetary science CdZnTe gamma-ray spectrometer Monte Carlo simulation charge sharing
Content Type	Text
Resource Type	Article

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