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473
ORTEC 473 Manuals
Manuals and User Guides for ORTEC 473. We have
1
ORTEC 473 manual available for free PDF download: Manual
ORTEC 473 Manual (31 pages)
Constant Fraction Discriminator
Brand:
ORTEC
| Category:
Control Unit
| Size: 41 MB
Table of Contents
Table of Contents
3
General
7
Functional Description
7
Physical Description
7
Specifications
8
Performance
8
Controls
8
Signal Input
8
Signal Outputs
8
External Delay
8
Electrical and Mechanical
9
Installation
9
General
9
Connection to Power
9
Input Connection
9
Output Connections
9
External Control
9
Operation
10
Theory of Operation
10
General
10
Lower Level Discriminator
11
Upper Level Threshold
11
Constant Fraction Discriminator
11
Constant Fraction Operation
12
Slo R.T. Rej Operation
12
Fig. 5.2. Simplified Block Diagram of the 473 Constant Fraction Discriminator
13
Leading Edge Operation G
14
S Output Pulse Generation G
14
External Selections
14
Power Supplies
15
Applications
15
Sj.2. Timing with Nal(TI) Scintillators
15
Timing with Large Ge(Li) Detectors
15
Fig. 6.1. a System for Gamma-Gamma Lifetime Measurement
16
Fig. 6.2. Timing over a Narrow Dynamic Range with the System of Fig. 6.1
16
Fig. 6.3. Plot of Time Resolution Vs Dynamic Range Using RCA 8850 Photomultiplier Tube
17
Fig. 6.4. Plot of Time Resolution Vs Dynamic Range Using RCA 8575 Photomultiplier Tube
17
Fig. 6.5. Typical Timing Spectrum over a Wide Dynamic Range (50:1) with Nal(TI)
18
Fig. 6.6. Plot of Time Resolution Vs Dynamic Range Using Nal(TI) and RCA 8575 PMT
18
Fig. 6.7. Gamma-Gamma Coincidence System Using
19
Timing with Other Detectors
20
Fig. 6.10. the Effect of 473 Threshold Setting on the Apparent Efficiency of Different Ge(Li) Detectors
20
Calibration
21
Equipment Required .Jg
21
Preliminary Procedure
21
Leading Edge Discriminator Test
21
Scintillation Mode Walk Test
22
Fig. 7.1. Test Setup for Leading Edge Discriminator Mode Calibration
22
Nai Mode Walk Test
23
Fig. 7.2. Test Setup for Scintillation Mode Walk Test
23
Ge(Li) Mode Walk Test
24
Fig. 7.3. Test Setup for Nal Mode Walk Test
24
Factory Repair
25
Fig. 7.4. Test Setup for Ge(Li) Mode Walk Test
25
Bibliography
26
Appendix
26
Replaceable Parts
26
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