Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Feasibility study of CdZnTe and CdZnTeSe based high energy X-ray detector using linear accelerator

  • Beomjun Park (Department of Chemistry, Konkuk University) ;
  • Juyoung Ko (Department of Chemistry, Konkuk University) ;
  • Jangwon Byun (Department of Chemistry, Konkuk University) ;
  • Byungdo Park (Department of Radiation Oncology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine) ;
  • Man-Jong Lee (Department of Chemistry, Konkuk University) ;
  • Jeongho Kim (Department of Radiation Oncology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine)
  • Received : 2023.03.27
  • Accepted : 2023.05.01
  • Published : 2023.08.25
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Abstract

CdZnTeSe (CZTS) has attracted attention for applications in X- and gamma-ray detectors owing to its improved properties compared to those of CdZnTe (CZT). In this study, we grew and processed single crystals of CZT and CZTS using the Bridgeman method to confirm the feasibility of using a dosimeter for high-energy X-rays in radiotherapy. We evaluated their linearity and precision using the coefficient of determination (R2) and relative standard deviation (RSD). CZTS showed sufficient RSD values lower than 1.5% of the standard for X-ray dosimetry, whereas CZT's RSD values increased dramatically under some conditions. CZTS exhibited an R2 value of 0.9968 at 500 V/cm, whereas CZT has an R2 value of 0.9373 under the same conditions. The X-ray response of CZTS maintains its pulse shape at various dose rates, and its properties are improved by adding selenium to the CdTe matrix to lower the defect density and sub-grain boundaries. Thus, we validated that CZTS shows a better response than CZT to high-energy X-rays used for radiotherapy. Further, the applicability of an onboard imager, a high-energy X-ray (>6 MV) image, is presented. The proposed methodology and results can guide future advances in X-ray dose detection.

Keywords

Acknowledgement

This research was supported by the Challengeable Future Defense Technology Research and Development Program through the Agency for Defense Development (ADD) funded by the Defense Acquisition Program Administration (DAPA) in 2022 (No. UI220006TD).

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