放射性核素有机迁移形式与性能评价

人们在以往的性能评价中大多注意地下水中放射性核素的无机迁移形式,而对其有机迁移形式则关注不够,这无疑会影响处置库系统性能评价的置信度。本文重点讨论了天然有机质在地下水中的分布及其对高放废物处置库系统性能评价的可能影响。最近研究结果表明：黏土岩一般为不透水层,DOC、HA和FA在黏土岩孔隙水中的质量浓度要远比在花岗岩地下水中的高。因此,对黏土岩中的预选场址要十分关注放射性核素有机迁移形式及其对性能评价的影响。花岗岩地下水中虽然DOC甚低,但是否可完全不考虑放射性核素有机迁移形式对性能评价的影响,现在未作定论,尚在进一步研究之中。

Organic migration forms of radionuclides and performance assessment

Much attention is paid to inorganic migration forms of radionuclides in groundwater during performance assessment before and organic migration forms,are seldom noted.Therefore some question may come into confidence level in performance assessment.This paper mainly discusses the distribution of organic substances in groundwater and their potential effect on performance assessment.The results obtained in recent years show that clay rocks are generally impermeable to water,but in some cases the interstitial water may be observed in them and the concentration of DOC,HA and FA is rather higher than that in granitic groundwater.The concentration of DOC is relatively low in granitic groundwater,but up to now the effect of organic migration forms of radionuclides in granitic groundwater on performance assessment is not finally determined,it is necessary to make further investigations.