Datasheet R331, R331-05 Datasheet (HAMAMATSU)

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

Figure 2: Typical Anode Luminous Sensitivity and
Gain

TPMHB0506EA TPMHB0507EA

5

10

10

Figure 3: Typical Anode Output Wave form

8

4

10

3

10

2

10

1

10

0

10

ANODE LUMINOUS SENSITIVITY (A/lm)

-1

10

500 700 200014001000 3000

GAIN

ANODE LUMINOUS SENSITIVITY

SUPPLY VOLTAGE (V)

Figure 4: Typical T ime Response

10

10

10

10

10

10

7

6

5

GAIN

(5mV/div)

RISE TIME : 2.6ns
FALL TIME : 9.7ns
SUPPL Y VOLTAGE

4

INPUT LIGHT

: 1500V

WAVELENGTH: 400nm

3

(5ns/div)

2

Figure 5: Typical T ransit Time Spread

TPMHB0508EA

200

100

80

ELECTRON TRANSIT TIME

60
40

20

10

TIME (ns)

8
6

4

ANODE PULSE RISE TIME

2

1

500 700 1000 1400 2000 3000

SUPPLY VOLTAGE (V)

TPMHB0510EA

SUPPLY VOLTAGE : 1500V

4

10

FWHM : 1100ps
INPUT LIGHT WAVELENGTH: 400nm

3

10

2

10

1

10

RELATIVE COUNTS

0

10

-10-8-6-4-20246810

TIME (ns)

PHOTOMULTIPLIER TUBES R331, R331-05

Figure 6: Dimensional Outline and Basing Diagram (Unit: mm)

FACEPLATE

PHOTO­CATHODE

HA COATING

DY12

DY11

DY9

DY7

DY5

53.0 ± 1.5
46MIN.

21 PIN BASE

SH

IC

101112

9

8

P

7
6
5

4

3

2

1

DY3

DY1

50 ± 0.2

IC

DY10

21

K

Socket (Supplied)

(E678-21A)

51
19

126 ± 2

R5

13MAX.

DY8

13

DY6

14

DY4

15

DY2

16
17

G

18

IC

19

20

IC

IC

TPMHA0072EB

56.8

5

13

4

6

TACCA0011EA

* Shield (SH) should be connected to Dy5.

HAMAMATSU PHOTONICS K.K., Electoron Tube Center
314-5, Shimokanzo, Toyooka-village, Iwata-gun, Shizuoka-ken, 438-0193, Japan, Telephone: [phone], Fax: [phone]

U.S.A.:

Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: [phone], Fax: [phone]

Germany:

Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: [phone], Fax: [phone]

France:

Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: [phone], Fax: [phone]

United Kingdom:
North Europe:
Italy:

Hamamatsu Photonics UK Limted: Lough Point, 2 Gladbeck Way, Windmill Hill, Enfield, Middlesex EN2 7JA, United Kingdom, Telephone: [phone], Fax: [phone]

Hamamatsu Photonics Norden AB: Färögatan 7, S-164-40 Kista Sweden, Telephone: [phone], Fax: [phone]

Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: [phone], Fax: [phone]

TPMH1209E01
JUL. 1998