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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