Non-destructive search for micrometer-scale minerals from the inside of rock samples with synchrotron radiation X-ray: a case study for platinum-group minerals

DOI Web Site 23 References
  • KOGISO Tetsu
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology (Present address) Graduate School of Human and Environmental Studies, Kyoto University
  • SUZUKI Katsuhiko
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • SUZUKI Toshihiro
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • UESUGI Kentaro
    Research and Utilization Division, Japan Synchrotron Radiation Research Institute
  • TAKEUCHI Akihisa
    Research and Utilization Division, Japan Synchrotron Radiation Research Institute
  • SUZUKI Yoshio
    Research and Utilization Division, Japan Synchrotron Radiation Research Institute

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Other Title
  • 放射光X線を用いた岩石内部の微小鉱物の非破壊探索 : 白金族鉱物を例にして
  • ホウシャコウ Xセン オ モチイタ ガンセキ ナイブ ノ ビショウ コウブツ ノ ヒハカイ タンサク ハッキンゾク コウブツ オ レイ ニ シテ

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Abstract

Synchrotron radiation X-ray is characterized by its ultra-high brightness, which is suitable for non-destructive analysis of rock samples at micrometer scale. We have developed new procedures for non-destructively detecting tiny secondary minerals from the inside of rock samples with subtraction imaging and microbeam X-ray fluorescence (μ-XRF) techniques. The subtraction imaging is a method for element mapping through a rock sample, which is deduced from the difference between two X-ray absorption images taken at energies slightly above and below absorption-edge energy of a target element. The effective spatial resolution is 〜5 to 20 μm for platinum-group elements. The μ-XRF is X-ray fluorescent analysis with an X-ray beam of submicrometer spot size, which is made with a Fresnel zone plate (FZP) optics. The μ-XRF can detect many elements simultaneously with sub-micrometer spatial resolution. With the subtraction imaging and μ-XRF, we have succeeded in non-destructively detecting small grains of platinum-group minerals from a geological reference material and a natural peridotite sample.

Journal

  • Chikyukagaku

    Chikyukagaku 42 (4), 217-228, 2008

    The Geochemical Society of Japan

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