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Performance and Blank Components of a Mass Spectrometric System for Routine Measurement of Helium Isotopes and Tritium by the 3He Ingrowth Method
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Vorgelegt in der Sitzung vom 1. Juli 1989 von Otto Haxel
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Artikel-Nr:
9783540517108
Veröffentl:
1989
Einband:
Paperback
Erscheinungsdatum:
02.11.1989
Seiten:
52
Autor:
Reinhold Bayer
Gewicht:
109 g
Format:
244x170x4 mm
Serie:
1989 / 5, Sitzungsber.Heidelberg 89
Sprache:
Englisch
Beschreibung:
For future studies of oceanic circulation it is necessary to develop the tritium measurement via 3He ingrowth into a routine procedure with a high capacity for efficient use. This paper attempts to demonstrate that this can be achieved using a commercial helium isotope mass spectrometer and special procedures for sample preparation, storage for 3He ingrowth, and 3He transfer from the ingrowth containers into the mass spectrometer. This method allows for measurement with a much higher precision and lower detection limit than is possible with counting techniques. Additionally, the parameters and blanks in routine operation of the system are discussed.
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1 Introduction.- 2 General Procedure.- 3 System Configuration.- 3.1 Gas Extraction Units.- 3.2 Inlet System.- 3.3 Mass Spectrometer.- 3.4 Computer Control.- 4 System and Handling Details.- 4.1 Gas Extraction Systems.- 4.2 Inlet System.- 4.3. Mass Spectrometer.- 4.4 Measurement of the 3He/4He Ratio.- 4.5 Tritium Measurement.- 5 Blanks.- 5.1 Helium Measurement.- 5.2 Tritium Measurement.- 6 'Ultra Low Level' Tritium Measurements.- 7 Intercalibration.- Acknowledgements.- References.