在电场作用下快速测定完整花岗岩石中核素的迁移参数

IF 2.6 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Xinyu Wang, Xiaojie Li, Yongmei Li, Longcheng Liu, Shuo Meng, Chunguang Li, Zhenzhong Liu, Xiaodong Li, Kaixuan Tan
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引用次数: 0

摘要

深部地质处置作为一种长期处置高放射性废物的策略已被广泛接受。获取放射性核素在高放射性废物处置库天然屏障(如花岗岩)中的迁移参数是对处置库进行安全评估的关键。为了快速确定核素在完整花岗岩中的扩散和吸附特性,利用改进的电迁移装置,在完整的北山花岗岩样本上施加恒定电压,对 I 和 ReO 两种示踪剂进行了测试。在五种不同电压条件下获得了 I 和 ReO 的突破曲线。为了更有把握地解释电迁移实验结果,本研究建立了一个基于一阶吸附动力学的平流-分散模型。根据该模型对突破曲线进行的数据分析表明,I 和 ReO 在完整北山花岗闪长岩中的有效扩散系数分别为 (6.81 ± 0.53) × 10 m/s 和 (6.45 ± 0.07) × 10 m/s。而这两种离子的分布系数分别为(9.06 ± 1.13)×10 m/kg和(9.81 ± 0.13)×10 m/kg。这表明 I 和 ReO 在北山花岗闪长岩中几乎不吸附。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rapid determination of the migration parameters of nuclides in intact granite rock under the action of electric field
Deep geologic disposal has been widely accepted as a strategy for long-term disposal of the high-level radioactive waste. It is principal to obtain the migration parameters of radionuclides in natural barrier, such as granite, of a high-level radioactive waste repository for safety assessment of the repository. To quickly determine the diffusion and sorption properties of nuclides in intact granite, two tracers, I and ReO, were tested with a modified electromigration device, by imposing a constant voltage over an intact Beishan granitic rock sample. The breakthrough curves of I and ReO were obtained under condition of five different voltages. To interpret the electromigration experimental results with more confidence, an advection-dispersion model based on first-order adsorption kinetics was developed in this study. Data analysis of the breakthrough curves by this model suggest that the effective diffusion coefficients of I and ReO in intact Beishan granodiorite rock are (6.81 ± 0.53) × 10 m/s and (6.45 ± 0.07) × 10 m/s, respectively. While the distribution coefficient of the two ions are (9.06 ± 1.13) × 10 m/kg and (9.81 ± 0.13) × 10 m/kg, respectively. This indicates that I and ReO hardly adsorb in Beishan granodiorite rock.
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来源期刊
Nuclear Engineering and Technology
Nuclear Engineering and Technology 工程技术-核科学技术
CiteScore
4.80
自引率
7.40%
发文量
431
审稿时长
3.5 months
期刊介绍: Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development
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