R4220P

PHOTOMULTlPLlER TUBES R4220 R4220P(For Photon Counting) Very High Cathode Sensitivity with Low Noise Photocathode FEATURES Spectral Response ................................... 185 to 710 nm High Cathode Sensitivity Luminous ...................................................... 100 A/lm Radiant at 410nm ............................................ 70 mA/W High Anode Sensitivity (at 1000V) Luminous ....................................................... 1200A/lm Radiant at 410nm ..................................... 8.4 105 A/W Low Dark Current .................................................... 0.2nA Low Dark Counts (R4220P) ................................... 10 cps Hamamatsu R4220 features extremely high cathode sensitivity, high Gain, and low dark current. Variant tube (R4220P) specially selected for photon counting application is also available. The R4220 is useful for fluorescence, chemiluminescence, Raman spectroscopy and low light level detection. GENERAL Parameter Spectral Response Wavelength of Maximum Response Photocathode MateriaI Minimum Effective Area Window Material Dynode Secondary Emitting Surface Structure Number of Stages Direct Interelectrode Capacitances Anode to Last Dynode Anode to All Other Electrodes Base Weight SuitabIe Socket SuitabIe Socket Assembly Figure 1: Typical Spectral Response Description/Value Unit 185 to 710 410 Low noise bialkali 8 24 UV glass Low noise bialkali Circular-cage 9 4 6 11-pin base JEDEC No. B11-88 45 E678–11A (option) E7...