Extended Red, High Sensitivity, Multialkali Photocathode 28 mm (1-1/8 Inch) Diameter, 9-Stage, Side-On Type

The R928 and R955 feature extremely high quantum efficiency, high current amplification, good S/N ratio and wide spectral response from UV to near infrared. The R928 employs a UV glass envelope and the R955 has a fused silica envelope for UV sensitivity extension. The R928 and R955 are well suited for use in broad-band spectrophotometers, atomic absorption spectrophotometers, emission spectrophotometers and other precision photometric instruments.

FEATURES
● Wide Spectral Response
   R928 .....................................................185 nm to 900 nm
   R955 .....................................................160 nm to 900 nm
● High Cathode Sensitivity
   Luminous ......................................................... 250 µA/lm
   Radiant at 400 nm .............................................74 mA/W
● High Anode Sensitivity (at 1000 V)
   Luminous .........................................................2500 A/lm
   Radiant at 400 nm ..................................... 7.4 × 10⁵ A/W
● Low Drift and Hysteresis