中文摘要：

介绍了对EMI公司两种8英寸光电倍增管D642KB和9350KA的研究情况；测量了相对量子效率、线性、增益、暗电流、后脉冲和对入射光的角度响应等光电倍增管的几项主要性能，其中相对量子效率和角度响应使用了特制的试验装置来达到测量目的；描述了这两种光电倍增管的各单项性能．

英文摘要：

This article is about the study of two kinds of EMI 8” PMTs, D642KB and 9350KA. Several characteristics including relative quantum efficiency（QE）, linearity, gain, dark current, afterpulse ratio and incident angle effect have been tested. Specially, dedicated systems have been set up for the measurements of relative quantum efficiency and incident angle effect. The performances of the two kinds of EMI PMTs are described here.