To study the energy spectrum response of a CsI(Tl) detector, we fabricated a new scintillation detector by coupling a CsI (Tl) crystal with an avalanche photodiode (APD) . Then, we designed a new low-noise readout circuit for the detector. Finally, we analyzed the effects of both temperature and bias voltage on the energy spectrum response and evaluated the capability to identify nuclides by connecting the detector to the readout circuit. The research showed that the noise of the readout circuit was 608e, with the noise slope being 5.71e/pF . At 20 o C, the detector achieved an excellent bias stability, the energy resolution reached an optimal value of 5.24% at a bias voltage of 370 V, thus proving a satisfactory performance. The signal-noise ratio reached 19:1 and the rise time of the output signals was 84 ns. The detector achieved an excellent energy spectrum response to 137 Cs, 152 Eu and 226 Ra radioactive sources, demonstrating a stron...

中文翻译：

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APD读取的CsI（Tl）检测器的能谱响应

为了研究CsI（Tl）探测器的能谱响应，我们通过将CsI（Tl）晶体与雪崩光电二极管（APD）耦合来制造了一种新型闪烁探测器。然后，我们为探测器设计了一种新的低噪声读出电路。最后，我们分析了温度和偏置电压对能谱响应的影响，并通过将检测器连接到读出电路评估了识别核素的能力。研究表明，读出电路的噪声为608e，噪声斜率为5.71e / pF。在20 o C时，检测器具有出色的偏置稳定性，在370 V的偏置电压下，能量分辨率达到了5.24％的最佳值，从而证明了令人满意的性能。信噪比达到19：1，输出信号的上升时间为84 ns。