Zhou Lang, Zhang Huyuan, Yan Ming, Chen Hang, Zhang Ming
Key Laboratory of Mechanics on Disaster and Environment in Western China (Lanzhou University), Ministry of Education, Qilian Building Rd 222 South Tianshui, Lanzhou, Gansu 730000 China.
Appl Radiat Isot. 2013 Dec;82:139-44. doi: 10.1016/j.apradiso.2013.07.004. Epub 2013 Jul 8.
For the safety assessment of geological disposal of high-level radioactive waste (HLW), the migration of Eu(III) through compacted bentonite-sand mixtures was measured under expected repository conditions. Under the evaluated conditions, advection and dispersion is the dominant migration mechanism. The role of sorption on the retardation of migration was also evaluated. The hydraulic conductivities of compacted bentonite-sand mixtures were K=2.07×10(-10)-5.23×10(-10)cm/s, The sorption and diffusion of Eu(III) were examined using a flexible wall permeameter for a solute concentration of 2.0×10(-5)mol/l. The effective diffusion coefficients and apparent diffusion coefficients of Eu(III) in compacted bentonite-sand mixtures were in the range of 1.62×10(-12)-4.87×10(-12)m(2)/s, 1.44×10(-14)-9.41×10(-14)m(2)/s, respectively, which has a very important significance to forecast the relationship between migration length of Eu(III) in buffer/backfill material and time and provide a reference for the design of buffer/backfill material for HLW disposal in China.
为了对高放废物地质处置进行安全性评估，在预期的处置库条件下测量了铕（III）在压实膨润土 - 砂混合物中的迁移情况。在所评估的条件下，平流和弥散是主要的迁移机制。还评估了吸附对迁移阻滞的作用。压实膨润土 - 砂混合物的水力传导率为K = 2.07×10（-10） - 5.23×10（-10）cm/s，使用柔性壁渗透仪在溶质浓度为2.0×10（-5）mol/l的情况下研究了铕（III）的吸附和扩散。铕（III）在压实膨润土 - 砂混合物中的有效扩散系数和表观扩散系数分别在1.62×10（-12） - 4.87×10（-12）m²/s、1.44×10（-14） - 9.41×10（-14）m²/s范围内，这对于预测铕（III）在缓冲/回填材料中的迁移长度与时间之间的关系具有非常重要的意义，并为我国高放废物处置缓冲/回填材料的设计提供参考。
