大亚湾核电站处置场天然屏障对^(85)Sr、^(134)Cs和^(60)Co的吸附性研究  

The Study of Adsorption of ^(85)Sr、^(134)Cs and ^(60)Co onto Natural Barrier of LILW Disposal Repository at Daya Bay NPP

作　　者：李祯堂 王辉[1] 游志均[1] 

机构地区：[1]中国辐射防护研究院,太原030006

出　　处：《辐射防护通讯》2003年第2期27-31,共5页Radiation Protection Bulletin

摘　　要：通过静态实验和动态实验 ,研究了 85Sr、1 34 Cs和 6 0 Co在大亚湾核电站中低放废物处置场近场钻井岩芯样和探槽样中的迁移分布规律。静态实验结果显示 ,同—种土样对 3种核素的吸附比差异很大 ,说明该地地质介质对核素的吸附具有选择性。 3种核素的吸附平衡时间为 1 2 0 h,分配系数 Kd 的平均值分别为 9.4× 1 0 m L/ g( 85Sr)、2 .3× 1 0 3m L/ g( 1 34 Cs)和 1 .3× 1 0 2 m L/ g( 6 0 Co)。动态实验结果给出了 3种核素的延迟系数 Rd 的平均值分别为 7.4× 1 0 2 ( 85Sr)、1 .8× 1 0 4 ( 1 34 Cs)和 1× 1 0 3( 6 0 Co) ,表明 85Sr在土柱中的迁移比 1 34 Cs和 6 0 Co的快。Through both static and dynamic experiments, the studies into migration and distribution of 90 Sr, 134 Cs and 60 Co in rock core samples, taken from drill hole at near field of LILW disposal site of Daya Bay Nuclear Power Plant, were conducted. As shown by static experiments,adsorption ratios varied greatly with the nuclides for the same soil samples. This is an indicative of strong selective of nuclides onto geologic media. The adsorption equilibrium time for these three nuclides is 120 h. The average K d  values of samples are respectively 3.4×10, 2.3×10 3 and 1.3×10 2 mL/g for 90 Sr, 134 Cs and 60 Co. In dynamic experiments,the R d  values are respectively are 7.4×10 2, 1.8×10 4 and 1.3×10 3, indicating faster migration rate of 90 Sr than those of 134 Cs and 60 Co .

关 键 词：大亚湾核电站 处置场 天然屏障 吸附性 锶85 钴60 铯134 低放射性废物 安全处置 浅地层处置 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]