CdZnTe探测器γ射线响应及稳定性研究

Investigation on γ-ray spectroscopy response and stability for CdZnTe detectors

基于自制的CdZnTe(CZT)平面探测器(10 mm×10 mm×2.5 mm),研究其对未经准直241Am(59.5 keV)γ射线连续10 h的光谱响应变化规律,未发现极化现象,并验证了其具有较好的长期稳定性。制备CZT弗里希电容栅格探测器(10 mm×5 mm×10 mm),测试发现,其对未经准直能量为662 keV137Csγ射线的能量分辨率约为3.65%。

γ-ray spectroscopy response for CdZnTe planar detector（10 mm×10 mm×2.5 mm） made by ourself is evaluated using an un-collimated 241Am（59.5 keV） radioactive source at room temperature for 10 h continuously,in which the polarization is not occurred.The γ-ray（59.5 keV） response spectra of the detector are acquired for a long time（1 year）,it shows that operation of the detector is stable.A thick CdZnTe capacitive Frisch grid detector（10 mm×5 mm×10 mm） is fabricated in order to approach high collection efficiency for high-energy γ-rays.An excellent energy resolution of 3.65% for ^137Cs at 662 keV is obtained without any additional signal processing.