Construction of I-Xe and 40Ar-39Ar dating system using a modified VG3600 noble gas mass spectrometer and the first I-Xe data obtained in Japan

• EBISAWA Noriko

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

• SUMINO Hirochika

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

• OKAZAKI Ryuji

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

• TAKIGAMI Yutaka

  Kanto Gakuen University

• HIRANO Naoto

  Earthquake Research Institute, University of Tokyo

• NAGAO Keisuke

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

• KANEOKA Ichiro

  Earthquake Research Institute, University of Tokyo

書誌事項

タイトル別名

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

抄録

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.

収録刊行物

• 質量分析

  質量分析 52 (4), 219-229, 2004

  一般社団法人 日本質量分析学会

キーワード

• Noble gas mass spectrometry
• I-Xe dating of meteorites
• ⁴⁰Ar-³⁹Ar dating
• Neutron irradiation

詳細情報

• CRID: 1390282681470924800
• NII論文ID: 10013522681
• NII書誌ID: AN0010555X
• DOI: 10.5702/massspec.52.219
• COI: 1:CAS:528:DC%2BD2cXptFWgtbs%3D
• ISSN: 18804225
• ISSN: 18843271
• ISSN: 13408097
• NDL書誌ID: 7085835
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7085835
• Web Site: http://www.jstage.jst.go.jp/article/massspec/52/4/52_4_219/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可