了解核種傳輸行為特性，特別是關鍵核種的化學特性與本土地質材料特性，是用過核子燃料處置概念中，處置設施安全性評估的重要根據。本研究透過分配係數Kd值求得本島地區之吸附相關參數，並利用線性回歸評估本島母岩礦物對核種吸附之關聯性。其中Cs核種的吸附Kd值約落在60 ~ 90 mL/g、Se核種的吸附Kd值約落在0 ~ 20 mL/g、U核種的吸附Kd值約落在400 ~ 600 mL/g。而Cs核種之吸附行為受到鉀含量和雲母類礦物影響，與母岩礦物中的鉀長石、白雲母、方解石、綠簾石較為相關；而Se、U核種之吸附行為則受到鐵氧化物類礦物所影響，與母岩礦物中的石英、黑雲母、綠泥石較為相關。而經過兩年的擴散，薄片擴散實驗並未獲取任何顯著的破出曲線。本研究所得之分配係數Kd值與擴散實驗結果，是日後安全評估的珍貴參考資料。

A solid safety assessment of spent nuclear fuel is strongly relied on the deep understanding in the correlation between nuclides transport and geological materials. In this study, we use linear regression to evaluate the connection between nuclide uptake and local mineral composition. Adsorption experiments were finished under aerobic and anaerobic condition. In both conditions, determined K_d values of Cs, Se and U adsorption to H-granite lie in the region between 60 mL/g to 90 mL/g, 0 mL/g to 20 mL/g, and 400 mL/g to 600 mL/g, respectively. Importantly, we found that Cs uptake is positively correlated to the content of K-feldspar、muscovite、calcite and epidote, while Se and U uptake is positively correlated to the content of quartz、biotite and chlorite. To simulate the nuclide transport mechanism in the real geological condition, diffusion experiment with sliced granite was carried out and there were no significant breakthroughs noted in the end of two years of diffusion. Along with the distribution coefficient determined, our results would be an important reference for the safety assessment in the near future.

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