... 5mm(1.12 inch), nine stage, side-on photomultiplier tubes, 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 ... stage, side-on photomultiplier tubes, borosilicate glass,double-alkali photocathode, 170 ~ 350nm spectral response, using a specially designed anti-lag ...