Fabrication and γ spectrum characteristic test of a laminated CdZnTe detector

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. (authors)