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

Ocampo Giraldo, L.; Bolotnikov, A. E.; Camarda, G. S.; De Geronimo, G.; Fried, J.; Gul, R.; Hodges, D.; Hossain, A.; Ünlü, K.; Vernon, E.; Yang, G.; James, R. B.

doi:10.1016/j.nima.2017.12.024

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:

Ocampo Giraldo, L. ^[1]; Bolotnikov, A. E. ^[2]; Camarda, G. S. ^[2]; De Geronimo, G. ^[2]; Fried, J. ^[2]; Gul, R. ^[2]; Hodges, D. ^[3]; Hossain, A. ^[2]; Ünlü, K. ^[4]; Vernon, E. ^[2]; Yang, G. ^[2]; James, R. B. ^[5]

Pennsylvania State Univ., University Park, PA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
University of Texas, El Paso, TX (United States)
Pennsylvania State Univ., University Park, PA (United States)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

Publication Date:: Mon Dec 18 00:00:00 EST 2017

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Savannah River National Laboratory (SRNL), Aiken, SC (United States); Savannah River Site (SRS), Aiken, SC (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

OSTI Identifier:: 1424941

Alternate Identifier(s):: OSTI ID: 1415035; OSTI ID: 1430084; OSTI ID: 1582941

Report Number(s):: BNL-200012-2018-JAAM; SRNL-STI-2017-00521; SRNL-STI-2018-00073
Journal ID: ISSN 0168-9002; TRN: US1801973

Grant/Contract Number:: SC0012704; AC02-98CH10886; AC09-08SR22470; AC02-98CH1-886

Resource Type:: 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 Issue: C; Journal ID: ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION; CdZnTe; High-granularity detectors; 3D pixelated detectors; Crystal defects; Charge sharing; Charge-loss correction; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats


                    Ocampo Giraldo, L., Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Ünlü, 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.

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                    Ocampo Giraldo, L., Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Ünlü, 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.  https://doi.org/10.1016/j.nima.2017.12.024

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                    Ocampo Giraldo, L., Bolotnikov, A. E., Camarda, G. S., De Geronimo, G., Fried, J., Gul, R., Hodges, D., Hossain, A., Ünlü, 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.  https://doi.org/10.1016/j.nima.2017.12.024.  https://www.osti.gov/servlets/purl/1424941.

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@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       = {Ocampo Giraldo, L. 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 Ünlü, 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       = C,

  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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Cited by: 4 works

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Table 1: Commercial detectors used in these measurements.

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