PHOTOMULTIPLIER TUBE

Modified R928, 8 mm × 6 mm Photocathode Size
Low Dark Counts, Extended Red Multialkali, High Sensitivity
For Photon Counting Applications

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.

FEATURES
● Low Dark Counts ....................................... 300 s-1 (at 25 °C)
● Low Dark Current ......... 2 nA (after 30 min storage in darkness)
● Wide Spectral Response ......................... 185 nm to 900 nm
● High Cathode Sensitivity
    Luminous .......................................................... 200 µA/lm
    Radiant at 400 nm .............................................. 68 mA/W

● High Anode Sensitivity (at 1000 V)
    Luminous .......................................................... 2000 A/lm
    Radiant at 400 nm ....................................... 6.8 × 105 A/W
● Low Drift and Hysteresis