Construction of I-Xe and ^<40>Ar-^<39>Ar Dating System Using a Modified VG3600 Mass Spectrometer and the First I-Xe Data Obtained in Japan

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Improvements in ion collectors of the VG3600 mass spectrometer used for <sup>40</sup>Ar-<sup>39</sup>Ar dating in the Radioisotope Center, University of Tokyo, have been performed. We also constructed a new compact vacuum line for extraction and purification of noble gases, and connected it to the mass spectrometer. The new noble gas mass spectrometry system enables us to measure all noble gases (He, Ne, Ar, Kr, and Xe) at low detection limits corresponding to 2×10<sup>-15</sup> cm<sup>3</sup> STP or 5×10<sup>3</sup> atoms of Kr and Xe. A newly designed W-coil furnace effectively heats small samples (1-100 mg) in a Mo-crucible with condition of low blank levels (10<sup>-10</sup> and 10<sup>-15</sup> cm<sup>3</sup> STP for Ar and Xe). Smaller sample sizes required for <sup>40</sup>Ar-<sup>39</sup>Ar dating have reduced activity levels. The system was preliminarily applied to I-Xe dating of neutron irradiated meteorites, Bjurböle, Allende and Yamato-74191, and discovered a late formation age of Yamato-74191 (26 Ma after Bjurböle) compared with the Allende meteorite.

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  • 質量分析 = Mass spectroscopy

    質量分析 = Mass spectroscopy 52(4), 219-229, 2004-08-01

    The Mass Spectrometry Society of Japan

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各種コード

  • NII論文ID(NAID)
    10013522681
  • NII書誌ID(NCID)
    AN0010555X
  • 本文言語コード
    ENG
  • 資料種別
    NOT
  • ISSN
    13408097
  • NDL 記事登録ID
    7085835
  • 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
    Z17-213
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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