... , 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 ... Red Sensitivity Index--Gain3x105Pulse rise time4ns Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, ...