HAMAMATSU R331, R331-05 Datasheet
For Liquid Scintillation Counting
Bialkali Photocathode, 51mm (2 Inch) Diameter, 12 Stages, Head-On Type
The R331 and the R331-05 are 51mm (2 Inch) diameter series photomultiplier tubes specifically developed for the liquid scintillation counting. They feature low background noise, high tritium efficiency, good
linearity and high gain. The R331 uses a synthetic silica input window
and the R331-05 uses a low K content borosilicate glass input window,
both with a frosted surface and convex-concave shape. They offer minimized glass scintillations and high collection efficiency.
FEATURES
Tritium efficiency in tritium window................................ 60% Typ.
Background noise in tritium window...............16cpm Typ. (R331)
18cpm Typ. (R331-05)
Tritium end point (T.E.P.) voltage.................................. 1700V Typ.
Dark pulse summation at T.E.P. voltage..............3 × 10
Figure of merit (E
2
/B).......................................................... 200 Typ.
4
cpm Max.
PHOTOMULTIPLIER TUBES
R331, R331-05
GENERAL
Parameter R331-05R331 Unit
Spectral Response
Wavelength of Maximum Response
Photocathode
Window
Material
Dynode
Direct
Interelectrode
Capacitances
Base
Weight
Suitable Socket
Material
Minimum Useful Area
Material
Shape
Structure
Number of Stages
Anode to Last Dynode
Anode to All Other
Electrodes
160 to 650
420
Bialkali
46
Synthetic silica
(Frosted)
Low K content
glass (Frosted)
Concave-Convex
Linear focused
12
2
2.5
21-pin glass base
151
E678-21A (Supplied)
300 to 650
borosilicate
nm
nm
—
mm dia.
—
—
—
—
pF
pF
—
g
—
Figure 1: Typical Spectral Response
TPMHB0505EA
100
R331
QUANTUM EFFICIENCY (%)
CATHODE RADIANT SENSITIVITY (mA/W)
10
0.1
0.01
1
200 400 600 800
R331-05
QUANTUM
EFFICIENCY
WAVELENGTH (nm)
CATHODE
RADIANT
SENSITIVITY
Subject to local technical requirements and regulat ions, availability of products included in this promotional material may var y. P lease consult with our sales office.
Information furnished by HAMA M ATSU is believed to be reliable. However, n o responsibility is assumed for possible inaccuracies or omissions. Specifications are
subject to change without notice. No patent rights are granted to any of the circuits described herein.
1998 Hamamatsu Photonics K.K.
©
PHOTOMULTIPLIER TUBES R331, R331-05
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter Value Unit
Supply Voltage
Between Anode and Cathode
Between Anode and Last Dynode
Average Anode Current
Ambient Temperature
A
2500
500
0.2
-80 to +50
CHARACTERISTICS (at 25°C)
Cathode
Sensitivity
Anode
Sensitivity
D
Gain
Anode Dark
E
Count
Time
Response
Parameter Min. Unit
Luminous
Quantum Efficiency
at 390nm
Radiant at 420nm
Blue
Luminous
Radiant at 420nm
R331
R331-05
Anode Pulse Rise Time
Electron Transit Time
D
Transit Time Spread
B
C
D
H
60
—
—
9.0
30
—
—
—
—
F
—
G
—
—
90
25
85
10.5
120
1.1 × 10
1.3 × 10
16
18
2.6
48
1.1
Max.Typ.
—
—
—
—
—
5
—
6
—
—
—
—
—
—
Vdc
Vdc
mA
°C
µA/lm
%
mA/W
µA/lm-b
A/lm
A/W
—
cpm
cpm
ns
ns
ns
NOTES
A: Averaged over any interval of 30 seconds maximum and
the whole photocathode is illuminated.
B: The light source is a tungsten filament lamp operated at
a distribution temperature of 2856K. The light input is
0.01 lm and 150 volts are applied between the cathode
and all other electrodes connected together as anode.
C: The value is cathode output current when a blue filter
(Corning CS 5-58 polished to 1/2 stock thickness) is
interposed between the light source and the tube under
the same condition as Note B.
D: Measured with the same light source as Note B and the
light input is 0.1µlm. The anode-to-cathode supply vol-
tage and voltage distribution ratio are shown in Table 1.
E: Background noise after 30 minute storage in darkness.
F: The rise time is the time for the output pulse to rise from
10% to 90% of the peak amplitude when the entire pho-
tocathode is illuminated by a delta function light pulse of
400nm.
G: The electron transit time is the interval between the
arrival of a delta function light pulse at the input window
of the tube and the time when the output pulse reaches
the peak amplitude. In measurement the entire
photocathode is illuminated.
H: Also called transit time jitter. This is the fluctuation in
electron transit time between individual pulses in the
single photoelectron state, and may be defined as the
FWHM of the frequency distribution of the transit times.
Table 1: Voltage Distribution Ratio
Electrodes
Distribution Ratio
K G Dy14Dy20Dy31Dy4
1.4
Supply Voltage: 1500Vdc, K: Cathode, Dy: Dynode, P: Anode, G: Grid
* Shield should be connected to Dy5.
Dy51Dy6
Dy7 Dy8 Dy9 Dy10Dy11Dy12
1111 11
P
111
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