摘要
以西南某低放废物处置库地质环境中板岩和土壤介质为研究对象,开展了238U和239Pu核素在这两种地质介质中的动态迁移实验研究,通过氚穿透实验(地下水流速=1 mL.min-1、实验柱连续淋洗时间=180 d)得到氚在板岩中的弥散系数DL为0.027 cm2.min-1,弥散度αL为0.324 cm,在土壤中的弥散系数DL为0.064 cm.2min-1,弥散度αL为0.895 cm.通过淋滤实验(地下水流速=0.1 mL.h-1、实验柱连续淋洗时间=350 min),得到了238U在板岩和土壤介质中的迁移速度分别为6.1—8.1 cm.a-1和7.3—8.5 cm.a-1,239Pu在板岩和土壤介质中的迁移速度分别为4.1—6.1 cm.a-1和3.7—4.9 cm.a-1.
In this paper, the dynamic migration experimental research work was carried out for 238U and 239Pu nuclides in shale and soil geological medium from a low level radioactive waste repository site in southwest China. Diffusion coefficient DL and degree of dispersion （aL ） of tritium were obtained through the tritium penetration experiment. In shale, DL value is 0. 027 cm2 min-1 and aL is 0. 324cm. In soil, DE value is 0. 064 cm2-min -1 and aL is 0. 895 cm. By the leaching experiment, the migration speed of nSU in shale and soil medium were 6.1-8.1 cm·a-1 and 7.3 -8.5 cma-1, and the migration speed of 239pu in shale and soil medium were 4.1-6.1 cm a- 1 and 3.7 - 4.9 cm. a- 1 respectively.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第12期1948-1952,共5页
Environmental Chemistry
基金
国家杰出青年科学基金(41025015)
国家自然科学基金(40974065)资助
