大面积气体闪烁正比计数器的研制及性能测试

摘要

本工作建立了一套有效探测面积大于300 cm2的气体闪烁正比计数器系统，并利用波长转换材料实现了普通光电倍增管对光信号的收集。对该系统进行了系列性能测试，测试结果表明，探测器对109 Cd 22.6 keV X射线具有7.5％的能量分辨率，点源距探测器3.2 cm时达到12.4％的探测效率。本工作的研究成果将为核污染场所低能X、γ放射性样品测量及超铀核素人体内照射污染测量等提供一种有力手段。%In this work ,a gas scintillation proportional counter (GSPC) with effective detection area of 300 cm2 was built .The wavelength shifting material was used to couple the photomultiplier and scintillator to achieve the light collection . The performance testing was done to test the detector .The result shows that the energy resolution for 109Cd 22.6 keV X ray is 7.5% ,and the total detection efficiency is 12.4% when the source‐detector separation distance is 3.2 cm .The detector studied in this work could be used to measure the low energy X and γ radioactive sample in radiation contaminated facilities ,and to measure the internal intake activity of transuranium elements .