Analysis and optimization of performance parameters of the 220Rn chamber in flow-field mode using computational fluid dynamics method
作者机构：School of Nuclear Science and TechnologyUniversity of South China School of Resources Environment and Safety EngineeringUniversity of South China
出 版 物：《Nuclear Science and Techniques》 (核技术(英文版))
年 卷 期：2024年第35卷第10期
页 面：130-145页
核心收录：
学科分类：082704[工学-辐射防护及环境保护] 08[工学] 0827[工学-核科学与技术]
基 金：supported by the National Natural Science Foundation of China (Nos. 12375310, 12175102, and 118750356) Youth Talent Foundation of Hunan Province of China (2022TJQ16) Graduate Research and Innovation Projects of Hunan Province (CX20230964)
主 题：CFD simulation Progeny Regulatory Thoron
摘 要：The impact of the radiation dose produced by222Rn/220Rn and its progeny on human health has garnered increasing interest in the nuclear research field. The establishment of robust, regulatory, and competent220Rn chambers is crucial for accurately measuring radioactivity levels. However, studying the uniformity of the220Rn progeny through experimental methods is challenging, because measuring the concentration of220Rn and its progeny in multiple spatial locations simultaneously and in real time using experimental methods is difficult. Therefore, achieving precise control of the concentration of220Rn and its progeny as well as the reliable sampling of the progeny pose significant challenges. To solve this problem, this study uses computational fluid dynamics to obtain the flow-field data of the220Rn chamber under different wind speeds and progenyreplenishment rates. Qualitative analysis of the concentration distribution of the progeny and quantitative analysis of the progeny concentration and uniformity of the progeny concentration are conducted. The research findings indicated that the progeny concentration level is primarily influenced by wind speed and the progeny-complement rate. Wind speed also plays a crucial role in determining progeny concentration uniformity, whereas the progeny-complement rate has minimal impact on uniformity. To ensure the accuracy of220Rn progeny concentration sampling, we propose a methodology for selecting an appropriate sampling area based on varying progeny concentrations. This study holds immense importance for enhancing the regulation and measurement standards of220Rn and its progeny.
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