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

概要

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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.
日本地球化学会の論文