Fabrication and performance test of double-layered parallel CdZnTe detector
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摘要: 实验采用并联方法制备了叠层(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。叠层CZT探测器较之单层探测器，能谱分辨率发生轻微恶化。实验初步表明，通过并联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。Abstract: A stacked (double-layered) CdZnTe detector was fabricated experimentally by parallel method and its gamma spectrum characteristics was tested using 241Am@59.54 keV and 57Co@122 keV gamma ray sources. Compared with a single-layered detector, for the higher energy gamma rays of 57Co@122 keV, the stacked CdZnTe detector exhibited higher detection efficiency and light peak efficiency, and improved the Compton continuum. The energy spectrum resolution of the stacked CdZnTe detector was slightly worse than that of the single-layered detector. The preliminary experimental results show that it is feasible to prepare a stacked CdZnTe detector by parallel method, and it can be inferred that preparation of stacked CdZnTe detectors of larger thickness will be beneficial for mid-high-energy gamma ray spectrometry.
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Key words:
- double layers /
- parallel /
- preparation of CdZnTe detectors /
- performance test
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图 1 并联叠层CZT探测器设计示意图
Figure 1. Schematic diagram of parallel stacked CdZnTe (CZT) detector design
图 4 两块单层CZT探测器及叠层CZT探测器的I-V特性图
Figure 4. I-V characteristics of two single- layered and one stacked CZT detectors
图 5 单层及叠层CZT探测器对241Am@59.54 keV γ射线的能谱响应
Figure 5. Energy spectrum response of single-layered and stacked CZT detectors to 241Am@59.54 keV γ ray
图 6 单层及叠层CZT探测器对57Co@122 keV γ射线的能谱响应
Figure 6. Energy spectrum response of single-layered and stacked CZT detectors to 57Co@122 keV γ ray
表 1 单、叠层探测器γ能谱分辨率及全能峰峰区计数率对比
Table 1. Comparison of γ spectrum resolution and counting rate at full energy peak area for single- and double- layered 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 5.53 991 4.49 1308 1 5.43 987 4.18 909 
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