College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang, Hunan, China.
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, MI, USA.
Environ Sci Pollut Res Int. 2020 Dec;27(34):43389-43395. doi: 10.1007/s11356-020-10890-1. Epub 2020 Sep 23.
Radon exhaled from building material surfaces is an important source of indoor radon. Yangjiang, located in the southern part of mainland China, is well-known as a high background radiation area (HBRA). Rather, high levels of radon and thoron concentration have been observed in adobe and brick houses. Reducing the indoor radon concentration remains an important issue in the high background radiation areas of China and the world. Generally, the walls of Chinese dwellings are solid. In this paper, a simple one-dimensional model for predicting the radon diffusion in a cavity wall is proposed, and an analysis formula describing the radon exhalation rate from cavity wall surfaces is presented. The influence on the radon exhalation rate due to leakage through structural joints and building material cracks is analyzed. The simulation results indicate that the radon exhalation rate from a cavity wall surface is far lower than that from a solid wall. The structure of cavity walls themselves is therefore useful as a mechanism for reducing the indoor radon in high background radiation areas across the world.
建筑材料表面释放的氡是室内氡的一个重要来源。中国南方的阳江是著名的高本底辐射地区（HBRA）。相反，在土坯和砖房中观察到氡和钍浓度较高。降低室内氡浓度仍然是中国和世界高本底辐射地区的一个重要问题。一般来说，中国住宅的墙壁都是实心的。在本文中，提出了一种用于预测空腔壁中氡扩散的简单一维模型，并给出了描述空腔壁表面氡释放率的分析公式。分析了通过结构接头和建筑材料裂缝泄漏对氡释放率的影响。模拟结果表明，空腔壁表面的氡释放率远低于实心墙的释放率。因此，空腔墙的结构本身可用作降低世界各地高本底辐射地区室内氡的机制。
