... , 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 glass,double-alkali ... --Gain3x105Pulse rise time4ns Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate glass, double ...