HAMAMATSU R4220, R4220P Datasheet
PHOTOMULTlPLlER TUBES
R4220
Very High Cathode Sensitivity with Low Noise Photocathode
FEATURES
Spectral Response ...................................
High Cathode Sensitivity
Luminous ......................................................
Radiant at 410nm ............................................
High Anode Sensitivity (at 1000V)
Luminous .......................................................
Radiant at 410nm .....................................
Low Dark Current ....................................................
Low Dark Counts (R4220P) ................................... 10 cps
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.
185 to 710 nm
100 A/lm
70 mA/W
1200A/lm
8.4 10
5
A/W
0.2nA
R4220P
(For Photon Counting)
GENERAL
Parameter Description/Value Unit
Spectral Response
Wavelength of Maximum Response
Photocathode
MateriaI
Minimum Effective Area
Window Material
Dynode
Secondary Emitting Surface
Structure
Number of Stages
Direct Interelectrode Capacitances
Anode to Last Dynode
Anode to All Other Electrodes
Base
Weight
SuitabIe Socket
SuitabIe Socket Assembly
185 to 710 nm
410
Low noise bialkali
8 24
UV glass
Low noise bialkali
Circular-cage
9
4pF
6pF
11-pin base
JEDEC No. B11-88
45
E678–11A (option)
E717–21 (option)
nm
mm
g
Figure 1: Typical Spectral Response
TPMSB0010EA
100
10
CATHODE
RADIANT
SENSITIVITY
1
QUANTUM
EFFICIENCY
QUANTUM EFFICIENCY (%)
0.1
CATHODE RADIANT SENSITIVITY (mA/W)
0.01
100 200 300
400 500
WAVELENGTH (nm)
600 700
800
Subject to local technical requirements and regulat ions, availability of products included in this promotional material may va r y. Please consult with our sales office.
lnformation furnished by HAMA M ATSU is believed to be reliabIe. However, no responsibility is assumed for possibIe inaccuracies or ommissions. Specifications are
subject to change without notice. No patent right are granted to any of the circuits described herein.
1994 Hamamatsu Photonics K.K.
©
PHOTOMULTlPLlER TUBES R4220, R4220P (For Photon Counting)
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter Value
Supply Voltage
Between Anode and Cathode
Between Anode and Last Dynode
Average Anode Current
A
1250
250
0.1
Unit
Vdc
Vdc
mA
CHARACTERISTlCS (at 25 )
Parameter Min. Typ. Typ.Max.
Cathode Sensitivity
Quantum Efficiency at 300nm (Peak)
Luminous
Radiant at 410nm (Peak) 70
Blue
Anode Sensitivity
Luminous
Radiant at 400nm 8.4 10
Gain
Anode Dark Current
After 30minutes Storage in the darkness 0.2 2.0
Anode Dark Counts
ENI(Equivalent Noise Input)
Time Response
Anode Pulse Rise Time
Electron Transit Time
Transit Time Spread (TTS)
Anode Current Stability
Current Hysteresis
Voltage Hysteresis
B
C
D
E
F
F
G
D
H
J
K
L
for General Purpose
R4220
23
80 100
8
12001000
5
7
1.2 10
3.30 10
-17
2.2
22
1.2
0.1
1.0
R4220P
for Photon Counting
Min. Max.
23 %
80 100 A/lm
70 mA/W
8 A/lm-b
1200 A/lm1000
5
8.4 10
7
1.2 10
0.2 0.5 nA
10 50 cps
3.30 10
-17
2.2
22
1.2
0.1
1.0
Unit
A/W
W
ns
ns
ns
%
%
NOTES
Averaged over any interval of 30 seconds maximum.
A:
The light source is a tungsten filament lamp operated at a distribution tem-
B:
perature of 2856K. Supply voltage is 150 volts between the cathode and all
other electrodes connected together as anode.
The value is cathode output current when a blue filter(Corning CS-5-58
C:
polished to 1/2 stock thickness) is interposed between the light source and
the tube under the same condition as Note B.
Measured with the same light source as Note B and with the anode-to-
D:
cathode supply voltage and voltage distribution ratio shown in Table 1 below.
Measured with the same supply voltage and voltage distribution ratio as
E:
Note D after removal of light.
Measured at the voltage producing the gain of 1 10
F:
G:
ENI is an indication of the photon-limited signal-to-noise ratio. It refers to
the amount of light in watts to produce a signal-to-noise ratio of unity in the
output of a photomultiplier tube.
ENI =
where q = Electronic charge (1.60 10
2q.ldb.G. f
S
-19
coulomb).
ldb = Anode dark current(after 30 minute storage) in amperes.
G = Gain.
f = Bandwidth of the system in hertz. 1 hertz is used.
S = Anode radiant sensitivity in amperes per watt at the wave length of peak response.
The rise time is the time for the output pulse to rise from 10% to 90% of the
H:
peak amplitude when the entire photocathode is illuminated by a delta
function light pulse.
The electron transit time is the interval between the arrival of delta function
J:
light pulse at the entrance window of the tube and the time when the anode
output reaches the peak amplitude. In measurement, the whole photocathode is illuminated.
6
.
K:L:Also called transit time jitter. This is the fluctuation in electron transit time
between individual pulses in the signal photoelectron mode, and may be
defined as the FWHM of the frequency distribution of electron transit times.
Hysteresis is temporary instability in anode current after light and voltage
are applied.
l
l
max.
Hysteresis = 100(%)
ANODE
CURRENT
5 6 7 (minutes)
0
min.
l
i
l
l
i
l
min.
max.
TIME
TPMSB0002EA
(1)Current Hysteresis
The tube is operated at 750 volts with an anode current of 1 micro-ampere for
5 minutes. The light is then removed from the tube for a minute. The tube is
then re-illuminated by the previous light level for a minute to measure the
variation.
(2)Voltage Hysteresis
The tube is operated at 300 volts with an anode current of 0.1 micro-ampere
for 5 minutes. The light is then removed from the tube and the supply voltage
is quickly increased to 800 volts. After a minute, the supply voltage is then
reduced to the previous value and the tube is re-illuminated for a minute to
measure the variation.
Table 1:Voltage Distribution Ratio
Electrodes K Dy1 Dy2 Dy3 Dy4 Dy5 Dy6 Dy7 Dy8 Dy9 P
Distribution
Ratio
1111111111
SuppIy Voltage : 1000Vdc
K : Cathode, Dy : Dynode, P : Anode
Loading...