... borosilicate glass, double-alkali photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate ... glass, double-alkali photocathode Features: Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate ... Sensitivity Index---Gain1.4x106Pulse rise time2ns Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, ...