Detailansicht
Performance and Blank Components of a Mass Spectrometric System for Routine Measurement of Helium Isotopes and Tritium by the 3He Ingrowth Method
Vorgelegt in der Sitzung vom 1.Juli 1989 von Otto Haxel 1989 / 5, Sitzungsberichte der Heidelberger Akademie der Wissenschaften 1989/5 - Sitzungsber.Heidelberg 89
Bayer, Reinhold/Schlosser, Peter/Bönisch, Gerhard et al
ISBN/EAN: 9783540517108
Umbreit-Nr.: 5967739
Sprache:
Englisch
Umfang: 44 S., 13 s/w Illustr., 44 p. 13 illus.
Format in cm:
Einband:
kartoniertes Buch
Erschienen am 02.11.1989
Auflage: 1/1989
- Zusatztext
- 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.
- Autorenportrait
- Inhaltsangabe1 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.- 4.1.1 Small Volume Samples.- 4.1.2 Large Volume Samples.- 4.2 Inlet System.- 4.2.1 Sample Inlet.- 4.2.2 Air Standards.- 4.2.3 Sample Purification.- 4.2.4 Helium/Neon Separation.- 4.3. Mass Spectrometer.- 4.4 Measurement of the 3He/4He Ratio.- 4.4.1 Procedure.- 4.4.2 Precision and Reproducibility.- 4.4.3 Non-linearity Effects.- 4.5 Tritium Measurement.- 4.5.1 Procedure.- 4.5.2 Standardization.- 4.5.3 3He Detection Limit.- 4.5.4 Data Evaluation.- 5 Blanks.- 5.1 Helium Measurement.- 5.1.1 Sampling and Sample Storage.- 5.1.2 Sample Extraction.- 5.2 Tritium Measurement.- 5.2.1 Tritium Blanks.- 5.2.2 3He Blanks.- 6 'Ultra Low Level' Tritium Measurements.- 7 Intercalibration.- Acknowledgements.- References.