Precise measurement of helium isotopes in terrestrial gases.

Access this Article

Author(s)

    • Sano Yuji
    • Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo
    • Wakita Hiroshi
    • Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo

Abstract

Helium isotope ratios of terrestrial natural gas samples were measured using a high-precision mass spectrometer and an ultrahigh-vacuum purification line. The line is equipped with a charcoal trap held at 40 K using a helium expansion refrigerating machine. To avoid interference, Ne was completely separated from He by the trap before the gas was admitted to the mass spectrometer. Ion beams of <SUP>3</SUP>He and <SUP>4</SUP>He were measured at the same time by a double collector system. A resolving power of about 550 at the 5% level of the peak height was attained for the complete separation of <SUP>3</SUP>He ions from those of HD and H<SUB>3</SUB>. Precision and reproducibility of the helium isotope ratio were less than 1%, examined by repeated measurements of an air standard. Accuracy of the ratio was checked by comparing observed data with reports in the literature.

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 61(4), 1153-1157, 1988

    The Chemical Society of Japan

Cited by:  14

Codes

  • NII Article ID (NAID)
    130001981400
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    0009-2673
  • Data Source
    CJPref  J-STAGE 
Page Top