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