Photomultiplier tube


28mm dia., Side-on type, Bialkali photocathode (Effective area : 8 mm x 24 mm /Spectral response : 185 nm to 750 nm)

Introduction of high sensitivity type

Here is our recommendation for the photomultiplier tube with higher sensitivity than R3788.
This is full compatible with R3788 and same accessories such as socket assembly can be used as well.
Please click the part number to find more details.

Type No. Peak Wavelength Cathode Luminous

Blue Sensitivity
Index (CS 5-58)

Anode Luminous
R3788 420 nm 120 µA/lm 10 1200 A/lm
R11540 420 nm 190 µA/lm 16 1900 A/lm


Type Side-on type
Tube Size Dia.28 mm
Photocathode Area Shape Square
Photocathode Area Size 8 mm x 24 mm
Wavelength (Short) 185 nm
Wavelength (Long) 750 nm
Wavelength (Peak) 420 nm
Spectral Response Curve Code 452U
Photocathode Material Bialkali
Window Material UV glass
Dynode Structure Circular-cage
Dynode Stages 9
[Max. Rating] Anode to Cathode Voltage 1250 V
[Max. Rating] Average Anode Current 0.1 mA
Anode to Cathode Supply Voltage 1000 V
[Cathode] Luminous Sensitivity Min. 100 μA/lm
[Cathode] Luminous Sensitivity Typ. 120 μA/lm
[Cathode] Blue Sensitivity Index (CS 5-58) Typ. 10
[Cathode] Red/White Ratio (R-68) Typ. 0.01
[Cathode] Radiant Sensitivity Typ. 90 mA/W
[Anode] Luminous Sensitivity Min. 500 A/lm
[Anode] Luminous Sensitivity Typ. 1200 A/lm
[Anode] Radiant Sensitivity Typ. 9.0 x 105 A/W
[Anode] Gain Typ. 1.0 x 107
[Anode] Dark Current (after 30min.) Typ. 5 nA
[Anode] Dark Current (after 30min.) Max. 50 nA
[Time Response] Rise Time Typ. 2.2 ns
[Time Response] Transit Time Typ. 22 ns

Dimensional outline (Unit: mm)

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