Atmospheric helium isotope ratio.

DOI Web Site 3 Citations Open Access
  • 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
  • Sheng Xu
    Earth Science Laboratory, The Institute of Physical and Chemical Research

Description

The belief that the isotope ratio of air helium is globally constant has meant that air helium is used in most laboratories as a helium isotopic standard. The well accepted air 3He/4He ratio of (1.39±0.01) × 10-6 is an average of the two isotopic determinations by Mamyrin et al. (1970) and Clarke et al. (1976). We measured absolute atmospheric 3He/4He ratio, taking into account the separation of helium from neon and possible occurrence of the helium isotope fractionation during the purification procedure. The 3He/4He ratio of (1.343±0.013)×10-6 observed at Ueno Park, Central Tokyo, Japan is apparently lower than the previous data. The discrepancy may be attributed to either experimental problems or natural phenomenon.

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