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Study on the Energy Spectrum Response of a CdZnTe Detector
Journal of the Korean Physical Society ( IF 0.6 ) Pub Date : 2020-05-01 , DOI: 10.3938/jkps.76.802
Yuandong Li , Liangquan Ge , Kun Sun , Shangqing Sun , Guoqiang Zeng , Chengjun Tan

In order to study the energy spectrum response of a CdZnTe detector, we firstly measured the temperature dependence and the bias dependence of the main characteristic parameters for both a quasi-hemispherical detector and a CAPture™ plus detector. Secondly, we designed a low-noise readout circuit for the CdZnTe detector and measured the noise. Finally, we evaluated the energy spectrum response of the detector to different radioactive sources at different temperatures by connecting the detector to the readout circuit. The research showed that both detectors had low leakage current and junction capacitance, as well as good stability in temperature and bias; the quasi-hemispheric detector had a smaller leakage current and junction capacitance compared to the CAPture™ plus detector; under zero input capacitor, the noise of the readout circuit was 612e, with the noise slope being 5.44e/pF; at room temperature(20 °C), the energy resolutions of the detector reached 3.84% and 1.36% for X-rays from 241 Am (59.5 keV) and gamma-rays from 137 Cs (662 keV), respectively; the signal-noise ratio of the output signal reached 31:1 with the rise time being 90 ns; at low temperature, the energy resolution reached 3.41% for the X-rays from 241 Am (59.5 keV); the detector achieved an excellent spectrum response and was able to distinguish clearly the energy peaks of 152 Eu and 226 Ra.

中文翻译:

CdZnTe探测器能谱响应的研究

为了研究 CdZnTe 探测器的能谱响应,我们首先测量了准半球探测器和 CAPture™ plus 探测器的主要特征参数的温度依赖性和偏置依赖性。其次,我们为CdZnTe探测器设计了低噪声读出电路并测量了噪声。最后,我们通过将探测器连接到读出电路来评估探测器在不同温度下对不同放射源的能谱响应。研究表明,两种探测器都具有较低的漏电流和结电容,以及良好的温度和偏置稳定性;与 CAPture™ plus 探测器相比,准半球探测器具有更小的漏电流和结电容;在零输入电容下,读出电路的噪声为612e,噪声斜率为5.44e/pF;在室温(20°C)下,探测器对241 Am(59.5 keV)的X射线和137 Cs(662 keV)的γ射线的能量分辨率分别达到3.84%和1.36%;输出信号信噪比达到31:1,上升时间为90 ns;在低温下,241 Am(59.5 keV)的X射线能量分辨率达到3.41%;该检测器实现了出色的光谱响应,能够清楚地区分 152 Eu 和 226 Ra 的能量峰。来自 241 Am (59.5 keV) 的 X 射线的能量分辨率达到 3.41%;该检测器实现了出色的光谱响应,能够清楚地区分 152 Eu 和 226 Ra 的能量峰。来自 241 Am (59.5 keV) 的 X 射线的能量分辨率达到 3.41%;该检测器实现了出色的光谱响应,能够清楚地区分 152 Eu 和 226 Ra 的能量峰。
更新日期:2020-05-01
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