R2949

PHOTOMULTIPLIER TUBE R2949 (Low Dark Counts Type of R928) Modified R928, 8 × 6mm Photocathode Area Size Low Dark Counts, Extended Red Multialkali, High Sensitivity For Photon Counting Applications FEATURES Low Dark Counts ................................................. 300cps (at 25°C) Low Dark Current ............................................. 2nA (after 30min.) Wide Spectral Response ........................................ 185 to 900 nm High Cathode Sensitivity Luminous ...................................................................... 200µ A/lm Radiant at 400nm ........................................................... 68mA/W High Anode Sensitivity (at 1000V) Luminous ...................................................................... 2000A/lm Radiant at 400nm .................................................... 6.8 × 105A/W Low Drift and Hysteresis The R2949 is a 28mm (1-1/8 inch) diameter, 9-stage, side-on type photomultiplier tube having the same extended red multialkali photocathode as the R928. The R2949 features very low dark counts, extremely high quantum efficiency, high gain, good S/N ratio and wide spectral response from UV to near infrared. The R2949 is well suited for use in various low-level photometries such as general single photon counting applications and fluorescence life time measurement. The R2949 is directly interchangeable with the R928. GENERAL Parameter Spectral Response Wavelength of Maximum Response Photocathode Material Minimum U...