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ORTEC 473 - Page 6

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CONSTANT

FRAaiON

DISC

SCINTx

»-Nal

DISC

LEVEt

EXT

DELAY

iSk:

I

Table of Contents

Table of Contents3
General7
Functional Description7
Physical Description7
Specifications8
Performance8
Controls8
Signal Input8
Signal Outputs8
External Delay8
Electrical and Mechanical9
Installation9
General9
Connection to Power9
Input Connection9
Output Connections9
External Control9
Operation10
Theory of Operation10
General10
Lower Level Discriminator11
Upper Level Threshold11
Constant Fraction Discriminator11
Constant Fraction Operation12
Slo R.T. Rej Operation12
Fig. 5.2. Simplified Block Diagram of the 473 Constant Fraction Discriminator13
Leading Edge Operation G14
S Output Pulse Generation G14
External Selections14
Power Supplies15
Applications15
Sj.2. Timing with Nal(TI) Scintillators15
Timing with Large Ge(Li) Detectors15
Fig. 6.1. a System for Gamma-Gamma Lifetime Measurement16
Fig. 6.2. Timing over a Narrow Dynamic Range with the System of Fig. 6.116
Fig. 6.3. Plot of Time Resolution Vs Dynamic Range Using RCA 8850 Photomultiplier Tube17
Fig. 6.4. Plot of Time Resolution Vs Dynamic Range Using RCA 8575 Photomultiplier Tube17
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 PMT18
Fig. 6.7. Gamma-Gamma Coincidence System Using19
Timing with Other Detectors20
Fig. 6.10. the Effect of 473 Threshold Setting on the Apparent Efficiency of Different Ge(Li) Detectors20
Calibration21
Equipment Required .Jg21
Preliminary Procedure21
Leading Edge Discriminator Test21
Scintillation Mode Walk Test22
Fig. 7.1. Test Setup for Leading Edge Discriminator Mode Calibration22
Nai Mode Walk Test23
Fig. 7.2. Test Setup for Scintillation Mode Walk Test23
Ge(Li) Mode Walk Test24
Fig. 7.3. Test Setup for Nal Mode Walk Test24
Factory Repair25
Fig. 7.4. Test Setup for Ge(Li) Mode Walk Test25
Bibliography26
Appendix26
Replaceable Parts26

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