... tubes, borosilicate glass, double-alkali photocathode Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier ... borosilicate glass, double-alkali photocathode Features: Diameter of 28.5mm(1.12 inch), nine stage, side-on photomultiplier ... optical properties to identify,replicate equipment. General data: Spectral Response Range300~680nmWavelength of Maximum Response 420nmMinimum effective Area ...