90Sr在干旱地区包气带砂土中的迁移研究

放射性废物处置的基本安全目标是保护人类和环境免受电离辐射的有害影响.开展处置场环境影响评价可以量化它对人体健康和环境潜在影响.90Sr是放射性废物中具有代表性的裂变核素.为了获取90Sr在干旱地区某处置场址包气带砂土中的迁移规律,采用静态实验和动态实验对其在砂土的迁移进行了研究.结果表明,对于该场址,砂土对90Sr的吸附能力较弱;静态实验测量得到的分配系数与动态实验拟合计算得到的相差约一个量级;采用非平衡模式模拟该场址包气带砂土中90Sr的迁移更为恰当.

Migration of 90Sr in Sandy Soil in Vadose Zone of Chinese Arid Area

The fundamental safety objective of disposal of radioactive waste is to protect people and the environment from harmful effects of ionizing radiation, which can be quantified by environment impact assessment.90Sr is a typical radionuclide in radioactive waste.Batch and column experiments are conducted to obtain the migration rules of 90Sr in sandy soil in vadose zone of the site of a disposal facility in Chinese arid area.The results show that 90Sr is weak adsorbed on the sandy soil.Comparison with the dynamic column experiment, Distribution coefficient obtainedby the batch experiment is nearly an order of magnitude higher for the site.It is suitable for nonequilibrium sorption model to simulate 90Sr migration in sandy soil in vadose zone of the site.