Enlow Emily, Diba Milad, Clayton James, Harris Brian, Abbaszadeh Shiva
Department of Electrical and Computer Engineering, University of California Santa Cruz, Santa Cruz, CA 95064 USA.
Polymer Assembly Technology Inc., Rockford, MI 49341 USA.
IEEE Trans Radiat Plasma Med Sci. 2023 Jul;7(6):580-586. doi: 10.1109/trpms.2023.3256406. Epub 2023 Mar 22.
Cadmium zinc telluride (CZT) detectors enable high spatial resolution and high detection efficiency and are utilized for many gamma-ray and X-ray spectroscopy applications. In this article, we describe a stable bonding process and report on the characterization of cross-strip CZT detectors before and after bonding to flexible circuit. The bonding process utilizes gold stud bonding and polymer epoxy technique to bond the flexible circuits to two CZT crystals and form a detector module in an anode-cathode-cathode-anode (ACCA) configuration. The readout electronics is optimized in terms of shaper setting and steering electrode voltage. The average full-width half maximum (FWHM) energy resolution at 662 keV of 110 CZT crystals tested individually was 3.5% ± 0.59% and 4.75% ± 0.48% prebonded and post-bonded, respectively. No depth correction was performed in this study. The average FWHM energy resolution at 662 keV of the scaled-up system with 80 CZT crystals was 4.40% ± 0.53%, indicating the scaled-up readout electronics and stacking of the modules does not deteriorate performance. The proper shielding and grounding of the scaled-up system slightly improved the system-wide performance. The FWHM energy resolution at 511 keV of the scaled-up system was 5.85% ± 0.73%.
碲锌镉（CZT）探测器具有高空间分辨率和高探测效率，被用于许多伽马射线和X射线光谱应用。在本文中，我们描述了一种稳定的键合工艺，并报告了交叉条带CZT探测器在与柔性电路键合前后的特性。键合工艺利用金柱键合和聚合物环氧树脂技术将柔性电路键合到两个CZT晶体上，并形成阳极-阴极-阴极-阳极（ACCA）配置的探测器模块。读出电子学在整形器设置和转向电极电压方面进行了优化。单独测试的110个CZT晶体在662 keV处的平均半高宽（FWHM）能量分辨率在键合前和键合后分别为3.5%±0.59%和4.75%±0.48%。本研究中未进行深度校正。具有80个CZT晶体的放大系统在662 keV处的平均FWHM能量分辨率为4.40%±0.53%，这表明放大的读出电子学和模块堆叠不会降低性能。放大系统的适当屏蔽和接地略微改善了全系统的性能。放大系统在511 keV处的FWHM能量分辨率为5.85%±0.73%。
