摘要
采用多孔介质双区扩散理论，通过现场试验，求出满足721-18废石场在退役覆土治理后，其氧析出率能降低到0．74Bq／（s·m2）限值以下的合理厚度。结果表明，721－18废石场覆土的氧扩散系数为D＝0．0502cm2／s；当覆土厚度依次为30、50、75和100cm时，相应氨析出率分别降低16％、29％、38％和49％；721－18废石场的合理覆土厚度约为46cm。
Reasonable cover thickness, or the eduction rate of radon is satisfied with below 0. 74 Bq/(s .m2) after cover treatment of waste-rock yard No. 721-18 during decommissioning,with the double diffusion theory of porous medium by field test.It turns out that the diffusion coefficient D of radon is 0. 0502 cm2/s for waste-rock yard No. 721-18 after cover- The eduction rates of radon decrease by 16%, 29 %, 38 % and 49 % respectively when the cover thicknesses are 30, 50, 75 and 100 cm- The reasonable cover thickness of the waste-rock yard No-721-18 is 46 cm.
出处
《铀矿冶》
CAS
1997年第2期110-114,共5页
Uranium Mining and Metallurgy
关键词
废石场
覆土治理
氡析出率
矿山
Decommissioning Soil cover treatment Eduction rate of radon
