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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Abstract

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.

Journal

  • Journal of the Mass Spectrometry Society of Japan

    Journal of the Mass Spectrometry Society of Japan 52(4), 219-229, 2004-08-01

    The Mass Spectrometry Society of Japan

References:  24

Cited by:  2

Codes

  • NII Article ID (NAID)
    10013522681
  • NII NACSIS-CAT ID (NCID)
    AN0010555X
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13408097
  • NDL Article ID
    7085835
  • NDL Source Classification
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL Call No.
    Z17-213
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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