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中文摘要：
文章采用动态淋滤实验,研究了不同流速和水相pH下,钙基膨润土对^239Pu核素迁移的阻滞性能。实验结果表明：钙基膨润土对^239Pu核素迁移的阻滞性能很好,100 d内淋出液中的放射性总量很少,^239Pu的淋出率最高仅为6.166‰,最小能达到0.209 7‰。流量和水相pH均会影响膨润土的阻滞性能,但是流量的影响更加明显,核素的淋出率随着流速的增大而增大。水相pH一方面改变了土壤性质,使土壤的渗水性能产生变化,另一方面影响了膨润土对^239Pu的吸附能力。2种影响同时作用,最终导致水相pH对淋出率的影响不成线性关系。在酸性水相条件下,膨润土的渗水性大大降低,阻滞性能达到最优。
英文摘要：
Retardation capability of Ca-bentonite on migration of ^239Pu under different flow rates and aqueous phase pH was studied by using dynamic leaching experiments. Result showed that Ca-bentonite has a good block retardation capability on ^239Pu. Within 100 days,the total radioactivities of leachates are very low. The highest leaching rate of ^239Pu is only 6.166%, and the lowest is 0.209 7%. The flow rate and aqueous phase pH both affect the retardation capability of Ca-bentonite, but the flow rate has a stronger affection. Leaching rate of ^239Pu increases as the flow rate growing. The aqueous phase pH changes the properties of soil, which causes the change of permeability of bentonite, while it affects the adsorption abilities of bentonite of ^239Pu . With these two effects, the leaching rate of ^239Pu doesn＇t have a linear relation with the aqueous phase pH. Under acidic aqueous condition, the permeability of bentonite reduces greatly, and shows a strong retardation capability.
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