Precise measurement of helium isotopes in terrestrial gases.

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概要

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• 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.

• 公益社団法人 日本化学会の論文

著者

• Wakita Hiroshi

  Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo

• Sano Yuji

  Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo

関連論文

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• Origin of ^C-enriched methane in the crater lake Towada, Japan
• Geochemical and Hydrological Observations for Earthquake Prediction in Japan
• Precise measurement of helium isotopes in terrestrial gases.

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