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ORTEC Manuals
Control Unit
473
Manual
ORTEC 473 Manual
Constant fraction discriminator
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Contents
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Table of Contents
Table of Contents
General
Functional Description
Physical Description
Specifications
Performance
Controls
Signal Input
Signal Outputs
External Delay
Electrical and Mechanical
Installation
General
Connection to Power
Input Connection
Output Connections
External Control
Operation
Theory of Operation
General
Lower Level Discriminator
Upper Level Threshold
Constant Fraction Discriminator
Constant Fraction Operation
Slo R.T. Rej Operation
Fig. 5.2. Simplified Block Diagram of the 473 Constant Fraction Discriminator
Leading Edge Operation G
S Output Pulse Generation G
External Selections
Power Supplies
Applications
Sj.2. Timing with Nal(TI) Scintillators
Timing with Large Ge(Li) Detectors
Fig. 6.1. a System for Gamma-Gamma Lifetime Measurement
Fig. 6.2. Timing over a Narrow Dynamic Range with the System of Fig. 6.1
Fig. 6.3. Plot of Time Resolution Vs Dynamic Range Using RCA 8850 Photomultiplier Tube
Fig. 6.4. Plot of Time Resolution Vs Dynamic Range Using RCA 8575 Photomultiplier Tube
Fig. 6.5. Typical Timing Spectrum over a Wide Dynamic Range (50:1) with Nal(TI)
Fig. 6.6. Plot of Time Resolution Vs Dynamic Range Using Nal(TI) and RCA 8575 PMT
Fig. 6.7. Gamma-Gamma Coincidence System Using
Timing with Other Detectors
Fig. 6.10. the Effect of 473 Threshold Setting on the Apparent Efficiency of Different Ge(Li) Detectors
Calibration
Equipment Required .Jg
Preliminary Procedure
Leading Edge Discriminator Test
Scintillation Mode Walk Test
Fig. 7.1. Test Setup for Leading Edge Discriminator Mode Calibration
Nai Mode Walk Test
Fig. 7.2. Test Setup for Scintillation Mode Walk Test
Ge(Li) Mode Walk Test
Fig. 7.3. Test Setup for Nal Mode Walk Test
Factory Repair
Fig. 7.4. Test Setup for Ge(Li) Mode Walk Test
Bibliography
Appendix
Replaceable Parts
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PriniPd in U.S.A.
Model 473
Constant Fraction
Discriminator
This manual applies to instruments
"Rev. 01" (on rear panel)
Copyright 1975, ORTEC Incorporated
2318 04C 0875
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