ORTEC 473 - Fig. 6.7. Gamma-Gamma Coincidence System Using

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13

ORTEC

4b6

HV

POWER

SUPPLY

1

by

1

in.

KL

236

Anode

ORTEC

RCA

265

8575

PM

BASE

PM

TUBE

ORTEC

473

CONST

FRACTION

DISCRIMI

NATOR

Ge(Li)

45CC

Na

Source

ORTEC

416A

GATE

AND

DELAY

GENERATOR

Start

ORTEC

457

TIME

TO

PULSE

HEIGHT

CONVERTER

Stop

ORTEC

455

CONST

FRACTION

TIMING

SCA

ORTEC

120A

PREAMP

ORTEC

452

SPECTROS-

COPY

AMPLIFIER

ORTEC

425

NANOSECOND

DELAY

ORTEC

473

CONST

FRACTION

DISCRIMI

NATOR

ORTEC

459

DETECTOR

BIAS

SUPPLY

won'

ORTEC

454

TIMING

FILTER

AMPLIFIER

Gate

ORTEC

6220

MULTI

CHANNEL

ANALYZER

Fig.

6.7.

Gamma-Gamma

Coincidence

System

Using

Plastic

Scintillator

and

a

Large

Ge{Li)

Coaxial

Detector.

1

Start:

KL236

(1x1),

RCA

8575

Photomultiplier

Tube

Stop:

Gel

Li)

Coax,

12.5%,

62.3

cc

1.1:1

Dynamic

Range

FWHM

FWTM

FW

1/100

M

CF

5.0

ns

10.0

ns

17.2

ns

SRT

5.0

ns

9.5

ns

17.6

ns

Fig.

6.8.

Timing

Spectrum

for

a

Narrow

Dynamic

Range

(1.1:1)

for

the

System

of

Fig.

6.7.

DDDRHHE5

22

Na

Start:

KL236,

RCA

8575

Ptiotomultipiier

Tube

Stop:

Ge(Li),

12.5%,

62.3

cc

10:1

Dynamic

Range

FWHM

FWTM

FW

1/100

M

CF

SRT

4.5

ns

4.4

ns

13.2

ns

9.4

ns

17.3

ns

Fig.

6.9.

Timing

Spectrum

for

a

Wide

Dynamic

Range

(10:1)

for

the

System

of

Fig.

6.7.

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