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Development of a Virtual Frisch-Grid CZT Detector Based on the Array Structure

방사선방어학회지 2020년 45권 1호 p.35 ~ 44
김영학, 이원호,
소속 상세정보
김영학 ( Kim Young-Hak ) - Korea University Department of Bio-convergence Engineering
이원호 ( Lee Won-Ho ) - Korea University School of Health and Environmental Science

Abstract


Background: Cadmium zinc telluride (CZT) is a promising material because of a high detection efficiency, good energy resolution, and operability at room temperature. However, the cost of CZT dramatically increases as its size increases. In this study, to achieve a large effective volume with relatively low cost, an array structure comprised of individual virtual Frisch-grid CZT detectors was proposed.

Materials and Methods: The prototype consisted of 2 × 2 CZTs, a holder, anode and cathode printed circuit boards (PCBs), and an application-specific integrated circuit (ASIC). CZTs were used and the non-contacting shielding electrode method was applied for virtual Frisch-grid effect. An ASIC was used, and the holder and the PCBs were fabricated. In the current system, because the CZTs formed a common cathode, a total of 5 channels were assigned for data processing.
Results and Discussion: An experiment using 137Cs at room temperature was conducted for 10 minutes. Energy and timing information was acquired and the depth of interaction was calculated by the timing difference between the signals of both electrodes. Based on obtained three-dimensional position information, the energy correction was carried out, and as a result the energy spectra showed the improvements. In addition, a Compton image was reconstructed using the iterative method.

Conclusion: The virtual Frisch-grid CZT detector based on the array structure was developed and the energy spectra and the Compton image were successfully acquired.

키워드

Virtual Frisch-Grid CZT; Array Structure; Spectroscopy; Compton Imaging; Radiation Monitoring

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