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グリムゼル花崗閃緑岩の単一割れ目中の核種移行特性評価,2; 鉱物・間隙分析

Radionuclide migration in single fracture of granodiorite at the Grimsel Test Site, 2; Mineral and pore investigations

佐藤 久夫*; 赤木 洋介*; 舘 幸男  ; 松本 一浩

Sato, Hisao*; Akagi, Yosuke*; Tachi, Yukio; Matsumoto, Kazuhiro

結晶質岩の割れ目中核種移行モデルの確証に資するため、スイスグリムゼル原位置試験場から採取した単一割れ目を含む花崗閃緑岩試料を対象に、X線CT測定より割れ目面からマトリクスを構成する鉱物分布を解析するとともに、EPMA元素マッピングによる鉱物分布解析によりその妥当性を確認した。これらの結果から、割れ目の開口幅や連続性、及び割れ目近傍の鉱物分布の不均質性等の定量的解析手法を検討した。

To validate radionuclide migration model in single fracture in crystalline rocks, the granodiorite sample with single fracture from the Grimsel Test Site in Switzerland was investigated focusing on the minerals and pores distributions. Mineral distributions from fracture surface to matrix were evaluated by X-ray CT, and were validated by comparing the elemental mapping measured by EPMA. Based on these results, the qualitative analysis methods for aperture and connectivity in fracture, and minerals distribution near fracture surface were developed.

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