Accurate Measurement of Atmospheric Helium Isotopes

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We have developed an analytical system to measure atmospheric <sup>3</sup>He/<sup>4</sup>He ratios precisely by using a static vacuum operation mass spectrometer and an ultrahigh-vacuum purification line. After purification of the sample, helium was introduced into 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 700 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>. Repeated analysis of a sample calibrated against a standard showed a precision of about 0.2% error margin (2<i>σ</i>). This system has been applied to evaluating the <sup>3</sup>He/<sup>4</sup>He ratio of He Standard of Japan (HESJ), and for the assessment of the atmospheric variation of latitude. The observed <sup>3</sup>He/<sup>4</sup>He ratio of HESJ, 20.405 ± 0.040<i>R</i><sub>air</sub> (2<i>σ</i>) agrees well with the value of 20.408 ± 0.044<i>R</i><sub>air</sub> by Lupton and Evans, but is smaller than the recommended value of 20.63 ± 0.10<i>R</i><sub>air</sub> in a literature. Air samples collected from 45 to 20°N in the Far East showed a slight decrease of the <sup>3</sup>He/<sup>4</sup>He ratio with latitude. Even though the variation is attributable to an experimental artifact, it may not preclude the possibility that the anthropogenic release of crustal <sup>4</sup>He is significant in the high-latitude region of the northern hemisphere.

収録刊行物

  • Analytical sciences : the international journal of the Japan Society for Analytical Chemistry  

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 24(4), 521-525, 2008-04-10 

    The Japan Society for Analytical Chemistry

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各種コード

  • NII論文ID(NAID)
    10021099740
  • NII書誌ID(NCID)
    AA10500785
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09106340
  • NDL 記事登録ID
    9452333
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z54-F482
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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