双层并联碲锌镉探测器制备及性能测试

Fabrication and performance test of double-layered parallel CdZnTe detector

实验采用并联方法制备了叠层(双层)碲锌镉探测器,并利用241 Am@59.54keV和57 Co@122keVγ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57 Co@122keVγ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。

A stacked （double-layered） CdZnTe detector was fabricated experimentally by parallel method and its gamma spectrum characteristics was tested using 2H Am@59.54 keV and ^37Co@122 keV gamma ray sources. Compared with a single lay ered detector, for the higher energy gamma rays of ^37Co@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 CdZnTc detectors of larger thickness will bc beneficial for mid high energy gamma ray spectrometry.