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Extended Red, High Sensitivity, Multialkali Photocathode
28mm (1-1/8 Inch) Diameter, 9-Stage, Side-On
GENERAL
FEATURES
Parameter Description/Value Unit
Spectral Response
The R928 and R955 feature extremely high quantum efficiency,
high current amplification, good S/N ratio and wide spectral re-
sponse from UV to near infrared. The R928 employs a UV glass
envelope and the R955 has a fused silica envelope for UV sen-
sitivity extension.
The R928 and R955 are well suited for use in broad-band spec-
trophotometers, atomic absorption spectrophotometers, emis-
sion spectrophotometers and other precision photometric in-
struments.
Wavelength of Maximum Response
185 to 900 nm
nm
Photocathode
MateriaI
400
Structure
R928
160 to 900 nm
R955
Approx. 4 pF
Anode to Last Dynode
Approx. 6 pF
Anode to All Other Electrodes
R928
R955
Minimum Effective Area
Multialkali
Secondary Emitting Surface
Multialkali
mm
Window Material
Weight
8 24
g
Approx. 45
Dynode
Direct Interelectrode Capacitances
Base
SuitabIe Socket Assembly
UV glass
Fused silica
Circular-cage
Number of Stages
9
11-pin base
JEDEC No. B11-88
E717–21 (option)
SuitabIe Socket
E678–11A (option)
lnformation furnished by HAMAMATSU 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.
©
1997 Hamamatsu Photonics K.K.
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
PHOTOMULTlPLlER TUBES
R928, R955
Wide Spectral Response
R928 ........................................................
R955 ........................................................
High Cathode Sensitivity
Luminous ......................................................
Radiant at 400nm .............................................
High Anode Sensitivity (at 1000V)
Low Drift and Hysteresis
Luminous ........................................................
Radiant at 400nm .....................................
185 to 900 nm
160 to 900 nm
250 A/lm
74mA/W
2500A/lm
7.4 10
5
A/W
Figure 1: Typical Spectral Response
TPMSB0001EB
100
10
1
0.1
0.01
100 200 300
400 500 600 700
800
900
1000
WAVELENGTH (nm)
CATHODE RADIANT SENSITIVITY (mA/W)
QUANTUM EFFICIENCY (%)
R928
QUANTUM EFFICIENCY
R955
CATHODE
RADIANT
SENSITIVITY