Hamamatsu R4125 data sheet
(As from Hamamatsu Photomultiplier Tubes and Assemblies Catalogue Jan. 1996)

The old (Sept. 1991) Ham.R4125 datasheet.


diameter 18.6mm (3/4'').
length 88mm.
Dynode structure linear focused.
No. of stages 10.
Photocath. window material borosilicate glass.
Photocathode material Extended Green Bialkali.
Spectral Response from 300nm to 650nm see Spectral Response Curve
Luminous Cath. Sens. Typ. 115 microA/lm.
Blue Cath. Sens. Typ. 11.0 microA/lm.
Q.E. at Peak Typ. 27%.
Anode to cathode voltage 1500V std applied voltage to measure characteristics
Current Amplification Typ. 8.7 x 10^5 ratio of anode current to photocathode current at 1500V
Lum. Anode Sens. Typ. 100 A/lm.
Dark Current Typ. 10nA.
Dark Current Max. 50nA.
Max. Anode to Cath. Voltage 1800V higher can cause electrical breakdown
Max. Average Anode Current 0.1mA over any interval of 30s
Rise Time Typ. 2.5ns.
Transit Time Typ. 16ns.
T.T. Spread 0.85ns FWHM of the frequency dist. of pulses transit time
Coincident resolving time 0.65ns CsF scint.
Pulse Height Res. Typ. 7.8 % NaI scint + 137Cs source
Long Term Stability Typ. 1.0 %.
Short Term Stability Typ. 2.0 %.
Pulse Linearity (+-2%dev) 100mA.
Pulse Linearity (+-5%dev) 170mA.