... glass, double-alkali photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, ... double-alkali photocathode Features: Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier tubes, borosilicate ... spectral response, using a specially designed anti-lag structure, with excellent output stability. Applicable technology areas: Spectrophotometer, colorimeter ...