Photomultiplier tube R212 Attributes General Suitable socket E678-11A parameter Description/Amount the unit Spectral response 185 to 650 nanometer Wavelength of maximum response 340 nanometer Cathode material Sb-Cs Minimum useful size 24 x 8 Mm window material UV glass The structure of the dynode Circular cage Number of steps Capacitance between electrode - anode to the last dynode 香 picofarad Capacitances, anode to other electrodes picofarad Foundation JEDEC No. B11-88 Figure 1: Typical spectral response cathode ray sensitivity (mAW) Quantum efficiency (%) -Quantum efficiency- Cathode 0.01 200 400 600 800 Wavelength (nm)