Very High Cathode Sensitivity with Low Noise Photocathode

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.

FEATURES
● Spectral Response ................................... 185 to 710 nm
● High Cathode Sensitivity
    Luminous ...................................................... 100 μA/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