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Related Experiment Video

Updated: Jul 10, 2026

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
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Development of Large Volume, High Performance Monolithic CZT Radiation Detector.

Henry Chen1, Handong Li1, Michael D Reed1

  • 1Kromek, Zelienople, PA, 16063, USA.

Proceedings of Spie--The International Society for Optical Engineering
|October 29, 2024
PubMed
Summary

Advancements in Cadmium Zinc Telluride (CZT) radiation sensors, grown using the traveling heater method (THM), show improved energy resolution for gamma spectroscopy and medical imaging. Depth of interaction correction significantly enhances detector performance.

Keywords:
CZTPETSPECTTHMlarge volumemedical imagingmonolithicsecurityspectroscopic

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Area of Science:

  • Materials Science
  • Nuclear Instrumentation
  • Medical Physics

Background:

  • Cadmium Zinc Telluride (CZT) is a semiconductor material crucial for radiation detection.
  • The traveling heater method (THM) is employed for growing high-quality CZT crystals.
  • Improving energy resolution in CZT detectors is essential for advanced imaging and spectroscopy.

Purpose of the Study:

  • To report recent progress in CZT radiation sensor development using the THM.
  • To demonstrate enhanced detector performance through depth of interaction correction.
  • To showcase applications in gamma spectroscopy and medical imaging.

Main Methods:

  • Fabrication of large volume monolithic pixelated CZT detectors (40×40×15 mm³).
  • Implementation of depth of interaction (DOI) correction techniques.
  • Characterization of detector performance, including energy resolution at various energies.

Main Results:

  • Initial gamma spectroscopy response showed < 2.5% energy resolution at 662 keV.
  • After DOI correction, pixelated CZT detectors (22×22×15 mm³) achieved < 1% energy resolution at 662 keV.
  • Pixelated detectors (20×20×6 mm³) for medical imaging demonstrated < 3% energy resolution at 122 keV.

Conclusions:

  • Proprietary THM crystal growth and robust device fabrication yield high-performance CZT detectors.
  • DOI correction is a key technique for significantly improving CZT detector resolution.
  • Developed CZT detectors show promise for advanced gamma spectroscopy and medical imaging applications, including PET and SPECT.