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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概要

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• Improvements in ion collectors of the VG3600 mass spectrometer used for 40Ar-39Ar 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 2×10-15 cm3 STP or 5×103 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 (10-10 and 10-15 cm3 STP for Ar and Xe). Smaller sample sizes required for 40Ar-39Ar 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.

• 日本質量分析学会の論文
• 2004-08-01

著者

• NAGAO KEISUKE

  Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo

• Sumino Hirochika

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Sumino Hirochika

  Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo

• Sumino Hirochika

  Laboratory For Earthquake Chemistry Graduate School Of Science The University Of Tokyo

• Kaneoka Ichiro

  Earthquake Research Institute, University of Tokyo

• Kaneoka Ichiro

  Earthquake Research Institute University Of Tokyo

• TAKIGAMI Yutaka

  Kanto Gakuen University

• Nagao Keisuke

  Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo

• Hirano Naoto

  Earthquake Research Institute University Of Tokyo

• Okazaki Ryuji

  Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo

• EBISAWA Noriko

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Ebisawa Noriko

  Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo

• Kaneoka Ichiro

  Earthquake Research Institute The University Of Tokyo

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