【摘要】 采用符合方法,测量级联γ放射源60Co在光电倍增管(PMT)光阴极窗上激发产生的切伦科夫光,从而测定PMT渡越时间涨落.用泊松加高斯卷积方法获得单(多)光电子峰位,处理不同光电子数的PMT渡越时间涨落.测试XP2020和透紫XP2020QPMT结果显示,测量的渡越时间与菲利浦公司给出的指标一致,渡越时间涨落与光电子数满足平方根反比关系.该方法对可分辨单(多)光电子峰的PMT是可行的.更多还原

【Abstract】 Using coincidence method, transit time spread (TTS) is measured with Cherenkov light produced by cascade γ radioactive source, 60Co on photocathode window of photomultiplier tube (PMT). Transit time distributions with single and multi-photon electrons are fitted to Poisson convoluted with Gaussian, and TTS are obtained. The study to XP2020 and XP2020Q PMTs shows that TTS is consistent with data supplied by Philips. TTS is inversely proportional to the square root of number of photoelectrons. The method is feasible when single and multi-photon electrons can be distinguished.更多还原