Adsorption experiments for radionuclides such as 3 H, 90 Sr and 99 Tc were conducted using fractured rock collected in unsaturated zone. The released radionuclide through artificial barrier from the near surface repository can be transported by the flow of rainfall or pore water through fractures in unsaturated zone and reach to groundwater flow. Therefore, it is important to investigate transport behavior (retardation) of radionuclides through fractured rock for the safety assessment and long-term performance of repository. Fractured rock samples were collected and characterized by X-ray microtomography (XMT) analysis, which can be used to develop a more robust unsaturated fracture transport model. When fracture-filling materials are exist, distribution coefficient of 90 Sr is higher than without fracture-filling materials. In this study, batch sorption distribution coefficient (Kd) of radionuclide was determined and used to increase our understanding of radionuclide retardtion through fracture-filling materials. 요약 : 불포화대 암반 단열에서 방사성 핵종인 3 H, 90 Sr and 99 Tc의 흡착실험이 진행되었다. 천층처분시설의 인공방벽을 통과 해 누출된 방사성 핵종은 빗물이나 공극수에 의해 불포화대 암반 단열을 통하여 지하수로 도달하게 된다. 그러므로 처분장 의 장기간 안전점검을 위해, 불포화대 암반 단열을 통한 방사성 핵종의 거동을 연구하는 것이 중요하다. 천층처분주변에서 채취된 불포화대 암반 단열 샘플을 이용하여 X-ray microtomography 분석을 수행하였고, 회분식 흡착실험을 이용하여 방사성 핵종인 3 H, 90 Sr and 99 Tc의 흡착실험이 진행되었다. 암반 단열의 충전물질로 불석광물 및 점토광물 존재 시 중흡착성 핵종인 90 Sr의 흡착 분배계수 값이 충전물질이 존재하지 않을 때 보다 높게 나타내었다. 본 연구를 통해, 암반 단열 특성화 및 방사 성 핵종의 흡착분배계수를 구했으며, 불포화대 암반 단열을 통한 핵종의 거동이 지연됨을 이해할 수 있었다.주제어 : 암반 단열, 불포화대, 방사성 핵종, 중저준위 방사성 폐기물, XMT
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