单光子分辨时间谱仪信噪比的研究  

Study on the ratio of signal to noise for single photon resolution time spectrometer

作　　者：汪兆民[1] 黄胜利[1] 许咨宗[1] 吴冲[1] 

机构地区：[1]中国科学技术大学现代物理系,合肥230027

出　　处：《核技术》2001年第4期269-273,共5页Nuclear Techniques

基　　金：国家自然科学基金! (5 995 2 0 0 2 )资助

摘　　要：研究了单光子分辨时间谱仪的信噪比和影响信噪比的因素 ,探讨了降低本底干扰、提高探测效率和信噪比的方法。结果表明 ,信噪比与探测器对源张的立体角和探测效率成正比 ,与电子学噪声成反比 ,合理选择辐射源的活度对减小偶然符合计数是重要的 。The ratio of signal to noise for single photon resolution time spectrometer and their influence factors were studied. A method to depress the background, to shorten the measurement time and to increase the ratio of signal to noise was discussed. Resuts show that ratio of signal to noise is proportional to solid angle of detector to source and detection efficiency, and inverse proportional to electronics noise. Choose the activity of the source was important for decreasing of random coincidence counting. To use a coincidence gate and a discriminator of single photon were an effective way of increasing measurement accuracy and detection efficiency.

关 键 词：信噪比 探测效率 单光子荧光衰减时间测量系统 单光子分辨时间谱仪 闪烁晶体 

分 类 号：TL817.9[核科学技术—核技术及应用] TL812