用于科学研究的 20 英寸直径光电倍增管
（从 1983 年到 1996 年）
（从 1996 年至今）
|采集效率||40% 至 50%||70%||90%|
|电子渡越时间分散度||4.4 ns||2.2 ns||1.0 ns|
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