低能量高剂量 X 射线辐照对 CdZnTe 探测器性能的影响

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2024-11-17 DOI:10.1016/j.nima.2024.170086

Hongguang Liu , Haiwen Yu , Ningbo Jia , Jianquan Chen , Mei Yang , Zhengyi Sun , Gang Yu , Yudong Li , Shouzhi Xi , Fan Yang , Tao Wang , Wanqi Jie

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引用次数: 0

摘要

本文研究了在管电压为 140 kV、累积剂量为 130 kGy 的条件下，X 射线管产生的高通量 X 射线对 CZT 探测器造成的辐照损伤。采用了深层瞬态光谱（i-DLTS）来表征缺陷。确定了四种辐照诱发的缺陷，分别对应于 Ec-0.1eV、Ev+0.17eV、Ev+0.27eV 和 Ec-0.55eV 的能级，与点缺陷 InCd+/0、VCd -/0、VCd 2-/- 和 TeCd 2+/+ 相关。辐照后，VCd -/0 的浓度从 5.63 × 1012 cm-3 变为 3.30 × 1013 cm-3，VCd 2-/- 的浓度从 1.13 × 1012 cm-3 变为 1.88 × 1013 cm-3。所有样品的电阻率在辐照后都呈上升趋势，其中样品 1 的变化最为显著，从 1.09 × 1011 Ω cm 倍增到 1.94 × 1011 Ω cm。然而，从阳极照射时，241Am（59.5 keV）谱峰的能量分辨率从 6.2% 降至 10.7%，信号噪声比从 42.24 降至 27.33。从阴极侧照射后，光子计数模块的计数性能下降了约 1.81%。

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The effect of low energy high-dose X-ray irradiation on the performance of CdZnTe detector

The paper investigated the irradiation damage of CZT detectors caused by high flux an X-ray from X-ray tube operated at a tube voltage of 140 kV and an accumulated dose of 130 kGy. Deep-level transient spectroscopy (i-DLTS) was employed to characterize the defects. Four types of irradiation-induced defects were identified, corresponding to the energy levels at Ec-0.1eV, Ev+0.17eV, Ev+0.27eV and Ec-0.55eV, which are associated with the point defects, In_Cd^+/0, V_Cd ^-/0, V_Cd ^2−/− and Te_Cd ^2+/+ respectively. After the irradiation, the concentration of V_Cd ^-/0 changed from 5.63 × 10¹² cm⁻³ to 3.30 × 10¹³ cm⁻³ and V_Cd ^2−/− increased from 1.13 × 10¹² cm⁻³ to 1.88 × 10¹³ cm⁻³. The resistivity of all samples showed an upward trend after the irradiation, with the most significant change observed in sample 1, where it doubled from 1.09 × 10¹¹ Ω cm to 1.94 × 10¹¹ Ω cm. However, the energy resolution for the spectrum peak of ²⁴¹Am (59.5 keV) decreased from 6.2% to 10.7% and the signal noise to ratio decreased from 42.24 to 27.33 when irradiated from anode. The counting performance of the photon counting module decreased by approximately 1.81% after irradiation on the cathode side.

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.