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Title: Use of High-granularity position sensing to correct response non-uniformities of CdZnTe detectors

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE NA OFFICE OF DEFENSE NUCLEAR NONPROLIFERATION
OSTI Identifier:
1156877
Report Number(s):
BNL-106022-2014-JA
Journal ID: ISSN 0003-6951; NN2001000
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 26
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Bolotnikov, A., Camarda, G., Cui, Y., De Geronimo, G., Fried, J., Hossain, A., Mahler, G., Maritato, M., Marshall, M., Petryk, M., Roy, U., Vernon, E., Yang, G., and James, R. Use of High-granularity position sensing to correct response non-uniformities of CdZnTe detectors. United States: N. p., 2014. Web. doi:10.1063/1.4883402.
Bolotnikov, A., Camarda, G., Cui, Y., De Geronimo, G., Fried, J., Hossain, A., Mahler, G., Maritato, M., Marshall, M., Petryk, M., Roy, U., Vernon, E., Yang, G., & James, R. Use of High-granularity position sensing to correct response non-uniformities of CdZnTe detectors. United States. doi:10.1063/1.4883402.
Bolotnikov, A., Camarda, G., Cui, Y., De Geronimo, G., Fried, J., Hossain, A., Mahler, G., Maritato, M., Marshall, M., Petryk, M., Roy, U., Vernon, E., Yang, G., and James, R. Wed . "Use of High-granularity position sensing to correct response non-uniformities of CdZnTe detectors". United States. doi:10.1063/1.4883402.
@article{osti_1156877,
title = {Use of High-granularity position sensing to correct response non-uniformities of CdZnTe detectors},
author = {Bolotnikov, A. and Camarda, G. and Cui, Y. and De Geronimo, G. and Fried, J. and Hossain, A. and Mahler, G. and Maritato, M. and Marshall, M. and Petryk, M. and Roy, U. and Vernon, E. and Yang, G. and James, R.},
abstractNote = {},
doi = {10.1063/1.4883402},
journal = {Applied Physics Letters},
number = 26,
volume = 104,
place = {United States},
year = {Wed Sep 03 00:00:00 EDT 2014},
month = {Wed Sep 03 00:00:00 EDT 2014}
}
  • CdZnTe (CZT) is a promising medium for room-temperature gamma-ray detectors. However, the low production yield of acceptable quality crystals hampers the use of CZT detectors for gamma-ray spectroscopy. Significant efforts have been directed towards improving quality of CZT crystals to make them generally available for radiation detectors. Another way to address this problem is to implement detector designs that would allow for more accurate and predictable correction of the charge loss associated with crystal defects. In this work, we demonstrate that high-granularity position-sensitive detectors can significantly improve the performance of CZT detectors fabricated from CZT crystals with wider acceptance boundaries,more » leading to an increase of their availability and expected decrease in cost.« less
  • Following our successful demonstration of the position-sensitive virtual Frisch-grid detectors, we investigated the feasibility of using high-granularity position sensing to correct response non-uniformities caused by the crystal defects in CdZnTe (CZT) pixelated detectors. The development of high-granularity detectors able to correct response non-uniformities on a scale comparable to the size of electron clouds opens the opportunity of using unselected off-the-shelf CZT material, whilst still assuring high spectral resolution for the majority of the detectors fabricated from an ingot. Here, we present the results from testing 3D position-sensitive 15×15×10 mm 3 pixelated detectors, fabricated with conventional pixel patterns with progressively smallermore » pixel sizes: 1.4, 0.8, and 0.5 mm. We employed the readout system based on the H3D front-end multi-channel ASIC developed by BNL's Instrumentation Division in collaboration with the University of Michigan. We use the sharing of electron clouds among several adjacent pixels to measure locations of interaction points with sub-pixel resolution. By using the detectors with small-pixel sizes and a high probability of the charge-sharing events, we were able to improve their spectral resolutions in comparison to the baseline levels, measured for the 1.4-mm pixel size detectors with small fractions of charge-sharing events. These results demonstrate that further enhancement of the performance of CZT pixelated detectors and reduction of costs are possible by using high spatial-resolution position information of interaction points to correct the small-scale response non-uniformities caused by crystal defects present in most devices.« less
  • Cited by 5
  • Here, we will present a concept for a calorimeter based on a novel approach of 3D position-sensitive virtual Frisch-grid CdZnTe (hereafter CZT) detectors. This calorimeter aims to measure photons with energies from ~100 keV to 20–50 MeV . The expected energy resolution at 662 keV is better than 1% FWHM, and the photon interaction position-measurement accuracy is better than 1 mm in all 3 dimensions. Each CZT bar is a rectangular prism with typical cross-section from 5×5 to 7×7 mm 2 and length of 2–4 cm. The bars are arranged in modules of 4×4 bars, and the modules themselves canmore » be assembled into a larger array. The 3D virtual voxel approach solves a long-standing problem with CZT detectors associated with material imperfections that limit the performance and usefulness of relatively thick detectors (i.e., >1 cm). Also, it allows us to use the standard (unselected) grade crystals, while achieving the energy resolution of the premium detectors and thus substantially reducing the cost of the instrument. Such a calorimeter can be successfully used in space telescopes that use Compton scattering of γ-rays, such as AMEGO, serving as part of its calorimeter and providing the position and energy measurement for Compton-scattered photons (like a focal plane detector in a Compton camera). Also, it could provide suitable energy resolution to allow for spectroscopic measurements of γ-ray lines from nuclear decays.« less
  • This article describes novel techniques to directly measure the electron mobility and mean free drift time product {mu}{sub e}{tau}{sub e} in semiconductor detectors. These methods are based on newly developed single polarity charge sensing and depth sensing techniques. Compared with conventional methods based on the Hecht relation, the new methods do not involve curve fitting, are less sensitive to the variation of pulse rise times, and allow the use of higher energy {gamma} rays typical of many applications. {copyright} {ital 1998 American Institute of Physics.}