《MASS SPECTROMETRY FOR URANIUM ISOTOPIC MEASUREMENTS》

Abstract9

Résumé9

AннотаЦИЯ10

Resumen10

1．INTRODUCTION11

2．DESCRIPTION OF TYPICAL INSTRUMENTATION13

(a)Mass Spectrometry Principles of Operation13

(b)Electron Bombardment Ion Source Instrument16

(c)Thermal Ion Source Instruments26

3．SAMPLE PREPARATION30

(a)Conversion to UF6 for Electron Bombardment Instruments30

(b)Deposition on Filaments for Thermal Instruments30

4．PREPARATION AND CALIBRATION OF STANDARD MATERIALS31

(a)Availability of Standard Materials31

(b)Hexafluoride Blending31

(c)Oxide Blending33

5．ANALYTICAL PROCEDURES34

(a)General Discussion34

(b)Absolute Measurements35

(c)Relative Comparison to Standards37

(d)Interpolative Relative Analysis38

(e)Dilution Technique to Determine Isotopic Enhancement or Depletion40

(f)Dilution Technique to Determine Uranium Concentration41

6．SUMMARY AND CONCLUSIONS43

7．REFERENCES44