叠层碲锌镉探测器制备及γ能谱特性测试

Fabrication and γ spectrum characteristic test of a laminated CdZnTe detector

实验制备了单层和叠层(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,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。

Single layer and laminated(double layer.)CdZnT'c detectors were prepared and their gamma spectrum character istics were tested using 24 Am@59.54 keV and 5,Co@122 keV gamma ray sources.Compared with the single layer detector,for the higher energy gamma rays of 5 Co@122 keV,the laminated CdZnT'e detectors exhibited higher detection efficiency and light peak efficiency,and improved the Compton continuum,showing similar performance to that of a single-layered CdZnT'e 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.T'he experimental results show that it is feasible to prepare the lami nated CdZnT'edetectorbystackingmethod,anditcan beinferredthatthepreparation of stackeddetectorsof largerthicknesswill be beneficial for mid-and high-energy gamma ray spectrometry.