叠层碲锌镉探测器制备及γ能谱特性测试

席发元; 宋凤军

doi:10.11884/HPLPB201830.170315

叠层碲锌镉探测器制备及γ能谱特性测试

doi: 10.11884/HPLPB201830.170315

西南科技大学核废物与环境安全国防重点学科实验室, 四川绵阳 621010

基金项目:

四川省教育厅资助科研项目 15ZA0106

核废物与环境安全国防重点学科实验室预研基金项目 15yyhk12

详细信息

作者简介:
席发元(1972－)，男，博士，从事核辐射探测器研究；xify66@163.com

中图分类号: TL816
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- 被引次数: 0
出版历程
- 收稿日期: 2017-08-11
- 修回日期: 2017-11-01
- 刊出日期: 2018-03-15

Fabrication and γ spectrum characteristic test of a laminated CdZnTe detector

Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China

摘要

摘要: 实验制备了单层和叠层(双层)碲锌镉探测器，并利用²⁴¹Am@59.54 keV和⁵⁷Co@122 keV γ射线源测试了其γ能谱特性。相比单层探测器，对于较高能量的⁵⁷Co@122 keV γ射线，叠层碲锌镉探测器表现出较高的探测效率和光峰值效率，较好地改善了康普顿连续统一体，表现出与整块等厚度碲锌镉探测器类似的性能；但光生载流子收集效率变差，能谱峰位向低道区偏移；能量分辨率未得到改善。实验初步表明，通过叠加方法制备叠层碲锌镉探测器是可行的，并可推断制备更大厚度的叠层探测器将有利于中高能γ射线能谱测量。
- 叠层 /
- 碲锌镉 /
- 探测器 /
- 制备 /
- 测试
Abstract: Single layer and laminated (double layer) CdZnTe detectors were prepared and their gamma spectrum characteristics were tested using ²⁴¹Am@59.54 keV and ⁵⁷Co@122 keV gamma ray sources. Compared with the single layer detector, for the higher energy gamma rays of ⁵⁷Co@122 keV, the laminated CdZnTe detectors exhibited higher detection efficiency and light peak efficiency, and improved the Compton continuum, showing similar performance to that of a single-layered CdZnTe detector of the same thickness; but charge carriers collection efficiency became worse, and the peak position of the energy spectrum shifted to lower channel area; energy resolution was not improved. The experimental results show that it is feasible to prepare the laminated CdZnTe detector by stacking method, and it can be inferred that the preparation of stacked detectors of larger thickness will be beneficial for mid- and high-energy gamma ray spectrometry.
- laminated /
- CdZnTe /
- detector /
- fabrication /
- test

HTML全文

图 1 封装后的单层CZT探测器

Figure 1. Single layer CZT detector after being encapsulated

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图 2 封装后的双层CZT探测器(图中红点为GND)

Figure 2. Double-layered CZT detector after being encapsulated (red point in middle picture is GND)

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图 3 用于拼接的两枚单层CZT探测器的I-V特性图

Figure 3. I-V characteristics of two single-layered CZT detectors for splicing

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图 4 单层及叠层CZT探测器对²⁴¹Am@59.54 keV γ射线的能谱响应

Figure 4. Energy spectrum response of single layer and stacked CZT detectors to ²⁴¹Am@59.54 keV gamma ray

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图 5 单层及叠层CZT探测器对⁵⁷Co@122 keV γ射线的能谱响应

Figure 5. Energy spectrum response of single layer and stacked CZT detectors to ⁵⁷Co@122 keV gamma ray

下载: 全尺寸图片幻灯片

表 1 单、双层探测器γ能谱分辨率及全能峰峰区计数率对比

Table 1. Comparison of gamma spectrum resolution and counting rate at full energy peak area for single and double layer detectors

number of CZT layers	γ spectrum resolution/% (²⁴¹Am)	counting rate at full energy peak area/cps (²⁴¹Am)	γ spectrum resolution/% (⁵⁷Co)	counting rate at full energy peak area/cps (⁵⁷Co)
2	8.93	1765	—	780
1	5.50	1718	—	538

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参考文献(15)

[1]	艾宪芸, 魏义祥. 室温半导体CdZnTe(CdTe)探测器性能综述[J]. 核电子学与探测技术, 2004, 24 (3): 325-329. https://www.cnki.com.cn/Article/CJFDTOTAL-HERE200403030.htm Ai Xianyun, Wei Yixiang. Basic characterization of CdZnTe(CdTe) detectors. Nuclear Electronics & Detection Technology, 2004, 24 (3): 325-329 https://www.cnki.com.cn/Article/CJFDTOTAL-HERE200403030.htm
[2]	黄勇, 杨磊, 杨汝基, 等. 碲化镉(CdTe)探测器的原理及医学应用[J]. 上海生物医学工程, 2005, 26 (4): 221-225. https://www.cnki.com.cn/Article/CJFDTOTAL-SHYC200504012.htm Huang Yong, Yang Lei, Yang Ruji, et al. The principle of cadmium telluride(CdTe) detector and medical application. Shanghai Journal of Biomedical Engineering, 2005, 26 (4): 221-225 https://www.cnki.com.cn/Article/CJFDTOTAL-SHYC200504012.htm
[3]	丁洪林, 罗丛, 张万昌. CdTe、CdZnTe核辐射探测器的制备性能和应用[C]//全国第十二届核电子学与核探测技术学术年会论文集. 2004: 88-91. Ding Honglin, Luo Cong, Zhang Wanchang. Characteristics and applications of CdTe/CdZnTe nuclear detectors. Proceedings of the 12th National Conference on Nuclear Electronics & Detection Technology. 2004: 88-91
[4]	朱世富, 赵北君, 王瑞林, 等. 室温半导体核辐射探测器新材料及其器件研究[J]. 人工晶体学报, 2004, 33 (1): 6-12. doi: 10.3969/j.issn.1000-985X.2004.01.002 Zhu Shifu, Zhao Beijun, Wang Ruilin, et al. Studies of new materials and devices for room-temperature nuclear radiation detectors. Journal of Synthetic Crystals, 2004, 33 (1): 6-12 doi: 10.3969/j.issn.1000-985X.2004.01.002
[5]	Liptac J, Parker R, Tang V, et al. Hard X-ray diagnostic for lower hybrid experiments on Alcator C-Mod[J]. Rev Sci Instr, 2006, 77: 103504. doi: 10.1063/1.2214695
[6]	Min Jiahua, Sang Wenbin, Liu Hongtao, et al. Improving the properties of CdZnTe crystals by annealing processes[J]. Rare Metal Materials and Engineering, 2007, 36 (3): 471-473.
[7]	张岚, 李元景, 朱维彬, 等. 碲锌镉探测器对低能X射线的探测[J]. 核电子学与探测技术, 2009, 29 (3): 517-520. https://www.cnki.com.cn/Article/CJFDTOTAL-HERE200903008.htm Zhang Lan, Li Yuanjing, Zhu Weibin, et al. Detection of CdZnTe detectors to low energy photons. Nuclear Electronics & Detection Technology, 2009, 29 (3): 517-520 https://www.cnki.com.cn/Article/CJFDTOTAL-HERE200903008.htm
[8]	Xu Huichao, Cheng Cheng, Zhao Cuilan. Characteristics of a prototype CdZnTe detector[J]. Nuclear Science and Techniques, 2007, 18 (6): 358-361. doi: 10.1016/S1001-8042(08)60008-1
[9]	Sellin P J, Davies A W, Gkoumas S, et al. Ion beam induced charge imaging of charge transport in CdTe and CdZnTe[J]. Nucl Instrum Meth B, 2008, 266 (8): 1300-1306.
[10]	Xu Yadong, Jie Wanqi, Sellin P J, et al. Study on temperature dependent resistivity of indium-doped cadmium zinc telluride[J]. J Phys D: Appl Phys, 2009, 42: 03505.
[11]	Meng L J, Tan J W, Spartiotis K, et al. Preliminary evaluation of a novel energy resolved photon counting gamma ray detector[J]. Nucl Instrum Methods Phys Res A, 2009, 604 (3): 548-554.
[12]	沈敏, 肖沙里, 张流强, 等. 不同厚度像素CdZnTe探测器的性能测试和评估[J]. 强激光与粒子束, 2014, 26 : 034001. doi: 10.3788/HPLPB201426.034001 Shen Min, Xiao Shali, Zhang Liuqiang, et al. Experiment and simulation of performance characteristics for pixellated CdZnTe detectors with various thickness. High Power Laser and Particle Beams, 2014, 26 : 034001 doi: 10.3788/HPLPB201426.034001
[13]	徐亚东, 王昌盛, 谷亚旭, 等. 载流子输运性能对CdZnTe晶体脉冲X射线响应特性的影响[J]. 功能材料, 2014, 45 (24): 24078-24081. https://www.cnki.com.cn/Article/CJFDTOTAL-GNCL201424016.htm Xu Yadong, Wang Changsheng, Gu Yaxu, et al. Effects of charge carrier transport properties on pulse X ray response characteristics of CdZnTe crystals. Functional Material, 2014, 45 (24): 24078-24081 https://www.cnki.com.cn/Article/CJFDTOTAL-GNCL201424016.htm
[14]	王闯, 查钢强, 齐阳, 等. CdZnTe像素探测器的制备与表征[J]. 原子能科学技术, 2015, 49 (7): 1320-1324. https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS201507028.htm Wang Chuang, Cha Gangqiang, Qi Yang, et al. Fabrication and characterization of CdZnTe pixel detector. Atomic Energy Science and Technology, 2015, 49 (7): 1320-1324 https://www.cnki.com.cn/Article/CJFDTOTAL-YZJS201507028.htm
[15]	李杨, 罗文芸, 贾晓斌, 等. 平面型CdZnTe探测器电荷收集效率对能谱测量的影响[J]. 上海大学学报, 2016, 22 (2): 231-237. https://www.cnki.com.cn/Article/CJFDTOTAL-SDXZ201602015.htm Li Yang, Luo Wenyun, Jia Xiaobin, et al. Influence of charge collection efficiency on energy spectrum for planar CdZnTe detector. Journal of Shanghai University (Natural Science), 2016, 22 (2): 231-237 https://www.cnki.com.cn/Article/CJFDTOTAL-SDXZ201602015.htm