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Title: Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes

Abstract

Here, we evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, <100 μμm, using a limited number of pixels dictated by the mechanical constraints and multi-channel readout electronics. High position sensitivity is important for improving the imaging capability of CZT gamma cameras. It also allows for making more accurate corrections of response non-uniformities caused by crystal defects, thus enabling use of standard-grade (unselected) and less expensive CZT crystals for producing large-volume position-sensitive CZT detectors feasible for many practical applications. We analyzed the digitized charge signals from a representative 9 pixels and the cathode, generated using a pulsed-laser light beam focused down to 10 m (650 nm) to scan over a selected 3×3 pixel area. We applied our digital pulse processing technique to the time-correlated signals captured from adjacent pixels to achieve and evaluate the capability for sub-pixel position resolution. As an example, we also demonstrated an application of 3D corrections to improve the energy resolution and positional information ofmore » the events for the tested detectors.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [4];  [2];  [2];  [5]
  1. Pennsylvania State Univ., University Park, PA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. of Texas at El Paso, El Paso, TX (United States)
  4. Pennsylvania State Univ., University Park, PA (United States)
  5. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE; USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22)
OSTI Identifier:
1424941
Alternate Identifier(s):
OSTI ID: 1415035; OSTI ID: 1430084
Report Number(s):
SRNL-STI-2017-00521; BNL-200012-2018-JAAM; SRNL-STI-2018-00073
Journal ID: ISSN 0168-9002; PII: S0168900217313906; TRN: US1800754
Grant/Contract Number:
AC09-08SR22470; SC0012704; AC02-98CH10886
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 884; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CdZnTe; High-granularity detectors; 3D pixelated detectors; Crystal defects; Charge sharing; Charge-loss correction; 36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION

Citation Formats

Giraldo, L. Ocampo, Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Unlu, K., Vernon, E., Yang, G., and James, R. B.. Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes. United States: N. p., 2017. Web. doi:10.1016/j.nima.2017.12.024.
Giraldo, L. Ocampo, Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Unlu, K., Vernon, E., Yang, G., & James, R. B.. Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes. United States. doi:10.1016/j.nima.2017.12.024.
Giraldo, L. Ocampo, Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Unlu, K., Vernon, E., Yang, G., and James, R. B.. Mon . "Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes". United States. doi:10.1016/j.nima.2017.12.024.
@article{osti_1424941,
title = {Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes},
author = {Giraldo, L. Ocampo and Bolotnikov, A. E. and Camarda, G. S. and De Geronimo, G. and Fried, J. and Gul, R. and Hodges, D. and Hossain, A. and Unlu, K. and Vernon, E. and Yang, G. and James, R. B.},
abstractNote = {Here, we evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, <100 μμm, using a limited number of pixels dictated by the mechanical constraints and multi-channel readout electronics. High position sensitivity is important for improving the imaging capability of CZT gamma cameras. It also allows for making more accurate corrections of response non-uniformities caused by crystal defects, thus enabling use of standard-grade (unselected) and less expensive CZT crystals for producing large-volume position-sensitive CZT detectors feasible for many practical applications. We analyzed the digitized charge signals from a representative 9 pixels and the cathode, generated using a pulsed-laser light beam focused down to 10 m (650 nm) to scan over a selected 3×3 pixel area. We applied our digital pulse processing technique to the time-correlated signals captured from adjacent pixels to achieve and evaluate the capability for sub-pixel position resolution. As an example, we also demonstrated an application of 3D corrections to improve the energy resolution and positional information of the events for the tested detectors.},
doi = {10.1016/j.nima.2017.12.024},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 884,
place = {United States},
year = {Mon Dec 18 00:00:00 EST 2017},
month = {Mon Dec 18 00:00:00 EST 2017}
}

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