希ガス同位体質量分析の温故知新  [in Japanese] History and Current Status of Noble Gas Mass Spectrometry to Develop New Ideas Based on Study of the Past  [in Japanese]

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Author(s)

    • 角野 浩史 SUMINO Hirochika
    • 東京大学大学院理学系研究科附属地殻化学実験施設 Geochemical Research Center, Graduate School of Science, The University of Tokyo

Abstract

Because noble gases are chemically inert, scarce in the earth and meteorite (except <sup>40</sup>Ar in the earth's atmosphere), and highly volatile, their isotope ratios have provided important insights in research fields of earth, planetary, and environmental sciences. The progress of noble gas geochemistry and cosmochemistry has been paced by the rate of developments in mass spectrometry. In this contribution, the history and basic principles of noble gas mass spectrometry and general techniques used in most modern laboratories are overviewed. The noble gas mass spectrometry has developed with inventions of various techniques—Nier type electron ionization (EI) source, static mode operation under ultrahigh-vacuum, adequately high resolution to distinguish very minor noble gas isotopes from interferences, and numerous small tips accumulated in laboratories—to attain increasingly greater precision to distinguish the often subtle variations in isotopic compositions, higher sensitivity to measure the low abundances found in many materials, and lower blanks to remove interference from atmospheric gases. New technologies recently exploited, such as simultaneous detection of noble gas isotopes with multicollector detection system, high-transmission EI source, resonance ionization, compression EI source, post-ionization of sputtered noble gases by focused ion beam, which enable us to detect quite small amount of noble gases down to several thousands of atoms, are opening new era of noble gas mass spectrometry. The highly-sensitive noble gas mass spectrometry can be applied to continuous monitoring of activity of volcanoes or active faults and to detect trace amount of noble-gas producing elements upon neutron irradiation, such as halogens, potassium, calcium, uranium, <i>etc.</i>

Journal

  • Journal of the Mass Spectrometry Society of Japan

    Journal of the Mass Spectrometry Society of Japan 63(1), 1-30, 2015

    The Mass Spectrometry Society of Japan

Codes

  • NII Article ID (NAID)
    130004786639
  • NII NACSIS-CAT ID (NCID)
    AN0010555X
  • Text Lang
    JPN
  • ISSN
    1340-8097
  • NDL Article ID
    026082466
  • NDL Call No.
    Z17-213
  • Data Source
    NDL  J-STAGE 
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