~3H和^(90)Sr示踪剂在土壤包气层示踪实验中的应用  

The Application of^3H and ^(90)Sr Tracer in Soil Aerated Zone Tracing Experiment

作　　者：武清华[1] 冀绍伟[1] 刘莲英[1] 赵英杰[1] 张华[1] 王玉兵[1] 李云峰[1] 黄庆春[1] 

机构地区：[1]中国辐射防护研究院,山西太原030006

出　　处：《同位素》2001年第3期179-183,共5页Journal of Isotopes

摘　　要：本工作测定了土壤包气层中 3 H和 90 Sr在天然条件和人工喷淋条件下的扩散系数 ,并研究了 3 H和 90 Sr示踪剂在黄土包气层中的迁移行为。结果表明 ,在华北地区黄土高原天然条件下 ,包气层中氚示踪剂以 0 .0 3cm/d速度迁移 ,纵向扩散系数 Dx 为 0 .5 2 cm2 /d;在 2 m× 2 m实验坑中 ,以 5 mm/h喷淋强度每天喷淋 3h的条件下 ,氚示踪剂以 2 .2 7cm/d的速度向下迁移 ,纵向扩散系数 Dx 为 7.75cm2 /d。包气层中天然条件下 90 Sr基本没有迁移 ;人工喷淋条件下 ,90 Sr以 3.7× 10 -3 cm/d速度迁移 ,纵向扩散系数 Dx 为 0 .0 3m2Diffusivity of 3H and 90 Sr are measured in soil aerated zone on both natural condition and artificial rainfall condition The migration regularity of 3H and 90 Sr are studied in loess aerated zone at the same time. The results show that the migration velocity of 3H tracer in aerated zone is 0.03 cm/d on natural condition in loess plateau of Huabei Region, the vertical diffusivity D x is 0.52 cm 2/d; In the experiment pit, the migration of 3H is 2.27 cm/d on artificial rainfall condition(the sprinkling intensity is 5 mm/h, 3 hours each day), the vertical diffusivity D x is 7.75 cm 2/d. The 90 Sr tracer in aerated zone haven't migrated, the migration velocity is 3.7×10 -3 cm/d, the vertical diffusivity D x is 0.03 cm 2/d.

关 键 词：^3H ^90SR 示踪实验 土壤包气层 放射性废物 浅地层处置 安全分析 氚 锶90 核素迁移 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护] TL942.21