Photomultiplier tube


28mm dia., Side-on type, Multialkali photocathode (Effective area : 8 mm x 24 mm /Spectral response : 185 nm to 900 nm)

Introduction of high sensitivity type

Here are our recommendations for the photomultiplier tubes with higher sensitivity than R928.
These are full compatible with R928 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

Red / White
Ratio (R-68)

Anode Luminous
R928 400 nm 250 µA/lm 0.3 2500 A/lm
R3896 450 nm 525 µA/lm 0.4 5000 A/lm
R10699 450 nm 650 µA/lm 0.43 8500 A/lm
R12829 450 nm 650 µA/lm 0.45 8500 A/lm
R13456 400 nm 280 µA/lm 0.4 2800 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) 900 nm
Wavelength (Peak) 400 nm
Spectral Response Curve Code 562U
Photocathode Material Multialkali
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. 140 μA/lm
[Cathode] Luminous Sensitivity Typ. 250 μA/lm
[Cathode] Blue Sensitivity Index (CS 5-58) Typ. 8
[Cathode] Red/White Ratio (R-68) Typ. 0.3
[Cathode] Radiant Sensitivity Typ. 74 mA/W
[Anode] Luminous Sensitivity Min. 400 A/lm
[Anode] Luminous Sensitivity Typ. 2500 A/lm
[Anode] Radiant Sensitivity Typ. 7.4 x 105 A/W
[Anode] Gain Typ. 1.0 x 107
[Anode] Dark Current (after 30min.) Typ. 3 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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