Development of a method for the quantitative analysis of hydrogen in minerals with a high-energy proton microbeam

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  • FURUNO Kohei
    Institute of Physics and Tandem Accelerator Center, University of Tsukuba
  • KUROSAWA Masanori
    Institute of Geoscience, University of Tsukuba
  • KOMATSUBARA Testuro
    Institute of Physics and Tandem Accelerator Center, University of Tsukuba
  • SASA Kimikazu
    Institute of Physics and Tandem Accelerator Center, University of Tsukuba
  • YAMATO Yoshihiro
    Academic Service Office for Humanities and Natural Sciences, Tandem Accelerator Center, University of Tsukuba
  • ISHII Satoshi
    Academic Service Office for Humanities and Natural Sciences, Tandem Accelerator Center, University of Tsukuba
  • OHSHIMA Hiroyuki
    Academic Service Office for Humanities and Natural Sciences, Tandem Accelerator Center, University of Tsukuba

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Other Title
  • 高エネルギー陽子マイクロビームによる鉱物中の水素定量分析法の開発
  • コウエネルギー ヨウシ マイクロビーム ニ ヨル コウブツ チュウ ノ スイソ テイリョウ ブンセキホウ ノ カイハツ

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This report describes our recent development that mainly aims at the quantitative determination of hydrogen concentration in melt inclusions confined in minerals. The method is based on the proton-proton elastic scattering at 20 MeV. Since the stopping power of protons at 20 MeV is very small in materials as silicates, protons pass through a 200 μm thick sample without appreciable energy loss. It is feasible, therefore, to carry out non-destructive hydrogen analysis of melt inclusions with sizes in the range from a few tens to approximately 200 micrometers. Besides the depth profile of hydrogen, a map of the three-dimensional hydrogen concentration is observable using a scanning microbeam. An example is presented on a melt inclusion in quartz from pyroclastic rocks collected at Enda, Zaoh-machi, Miyagi Prefecture, Japan.

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