Development of Nondestructive Heavy Elemental Analytical Method of Ancient Glass Artefacts Using High-Energy (116 keV) Synchrotron Radiation X-Ray Fluorescence Spectrometry

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  • ABE Yoshinari
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • KIKUGAWA Tadashi
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science Ancient Egyptian Museum
  • NAKAI Izumi
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science

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  • 116 keV の高エネルギー放射光を用いた蛍光X線分析による古代ガラスの非破壊重元素分析法の開発
  • 116keV ノ コウエネルギー ホウシャコウ オ モチイタ ケイコウ Xセン ブンセキ ニ ヨル コダイ ガラス ノ ヒハカイジュウ ゲンソ ブンセキホウ ノ カイハツ

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Abstract

<p>High-energy synchrotron radiation X-ray fluorescence spectrometry (HE-SR-XRF) utilizing 116 keV X-ray was applied to ancient glass artefacts for nondestructive-analysis of trace heavy elements including rare earth elements (REEs) that were useful for provenance identification. Prior to actual applications to ancient glass artefacts, we examined an effect of a sample thickness on spectrum obtained nondestructively and confirmed that an intensity-normalization using Compton scattering peak was effective within the range of 30∼60 keV in energy. Lower limits of detection and quantification were calculated for 19 elements (Cs. Ba, REEs, Hf, Ta, W) respectively and compared to literature data of trace heavy element concentration ranges determined by LA-ICP-MS of Late Bronze Age (LBA) glasses from Egypt and Mesopotamia. It was suggested that nondestructive HE-SR-XRF analysis has enough sensitivity to distinguish between LBA glasses from Egypt and Mesopotamia based on REEs compositions. In fact a significant difference between LBA glass from Egypt and Mesopotamia was found in the peak intensities of REEs in the spectra. A glass piece from LBA (Mycenaean) Greece which may be imported from Egypt or Mesopotamia was analyzed as an example of the provenance identification of ancient glass. A quantification of trace heavy elements using sensitive factors was carried out for the Mycenaean glass piece. It is found that quantified values are close to the literature data of the similar examples. The result suggests that the Mycenaean glass piece would be imported from LBA Egypt. It was therefore considered that HE-SR-XRF could be a powerful technique for the nondestructive analytical study of ancient glass artefacts.</p>

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