Experimental Study on Unsteady Radon Exhalation from the Overburden Layer of the Uranium Mill Tailings Pond under Rainfall

IF 1 4区工程技术 Q3 NUCLEAR SCIENCE & TECHNOLOGY

Science and Technology of Nuclear Installations Pub Date : 2022-09-19 DOI:10.1155/2022/9366056

Hong Wang, Wenhua Wang, Runcheng He, Changshou Hong, Jin Wang, Xiangyang Li, Yong Liu

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引用次数: 5

Abstract

In order to find out radon reduction performance of the overburden layer on uranium mill tailings (UMTs) pond beach surface after rainfall, the rainfall simulation experiment of the overburden layer was carried out with the self-developed equipment. Based on the radon migration model of the overburden layer on the UMTs pond beach surface, the change rule of radon exhalation in four types of compactness of the overburden layer within 120 hours after rainfall was studied, and the corresponding moisture content was also analyzed. The results show that the radon concentration in the overburden layer of UMTs increases nonlinearly; the dynamic change in moisture content of the overburden layer on the beach surface leads to the unsteady radon exhalation. The variation of radon exhalation shows three stages: increase, linear decrease, and stability tendency. After rainfall, radon exhalation rate increases due to water vapor and there is free radon seepage in pores. With the decrease of free radon production rate, radon exhalation rate gradually decreases until it reaches stability again. When the thickness of the overburden layer reduces, the porosity decreases with the increase in compactness of the overburden layer. While the decrease in radon reduction is more obvious, the less time it takes for radon exhalation to vary from unstable to stable overburden after rainfall.

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降雨条件下铀尾矿库覆盖层氡非稳态渗出的实验研究

为了了解铀尾矿库海滩表层覆盖层在降雨后的降氡性能，利用自行研制的设备对覆盖层进行了降雨模拟实验。基于UMTs池滩表层覆盖层氡迁移模型，研究了降雨后120小时内覆盖层四种密实度下氡析出的变化规律，并分析了相应的含水量。结果表明，UMT覆盖层氡浓度呈非线性增加；海滩表层覆盖层含水量的动态变化导致了不稳定的氡析出。氡析出量的变化表现为三个阶段：上升、线性下降和稳定趋势。降雨后，由于水蒸气的作用，氡的析出率增加，孔隙中存在自由氡渗流。随着自由氡生成率的降低，氡的呼出率逐渐降低，直至再次达到稳定。当覆盖层厚度减小时，孔隙率随着覆盖层压实度的增加而减小。虽然氡减少的减少更明显，但降雨后氡呼出从不稳定到稳定覆盖层所需的时间越短。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science and Technology of Nuclear Installations NUCLEAR SCIENCE & TECHNOLOGY-

CiteScore

2.30

自引率

9.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Science and Technology of Nuclear Installations is an international scientific journal that aims to make available knowledge on issues related to the nuclear industry and to promote development in the area of nuclear sciences and technologies. The endeavor associated with the establishment and the growth of the journal is expected to lend support to the renaissance of nuclear technology in the world and especially in those countries where nuclear programs have not yet been developed.