干旱区生态环境知识资源中心(Arid): Measurement and characteristics of radon flow in an extremely arid region based on a closed-system earth-air model

Arid

DOI	10.1016/j.jenvman.2024.120675
	Measurement and characteristics of radon flow in an extremely arid region based on a closed-system earth-air model
	Li, Hongshou; Li, Fei; Wang, Shunren
通讯作者	Li, HS
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	356
英文摘要	Radon (222Rn) is a radioactive gas that occurs naturally in the soil and is harmful to the environment and health. However, the measuring the amount of radon flowing is challenging. This study reveals the mechanism responsible for radon transportation and concentration variation, the main driving forces acting, and the key factors operating in the vadose zone. In this study, two separate holes were used to monitor the amount of earthair and radon flowing in and out of the soil in the extremely arid region in China where the Mogao Grottoes are located. Using a closed-system model, the quantity, characteristics, and regularity of the flow of earth-air and radon were thus determined on daily and yearly timescales. The same patterns of variation in earth-air flow and radon concentration were found at the two sites, both depending on the variation in the atmospheric pressure (AP). When the AP decreases, earth-air flows out from the soil with a high radon concentration. Conversely, when the AP increases, earth-air enters into the soil with a low radon concentration. Thus, radon is continuously emitted from the soil. The concentration of radon in the earth-air is proportional to the rate of flow of earth-air and therefore increases as the AP decreases. The radon emission also varies with the seasonal variation in temperature and AP, which is high in summer and low in winter. On a daily timescale, the radon varies in a bimodal manner. Therefore, the net amount of radon emitted from the soil is positively correlated with the amplitude of the AP fluctuation, temperature, soil porosity, and thickness of the vadose zone. The atmospheric pumping is the main driving force responsible for the radon emission. However, the surface closure, landform, cracks, faults, grain size, pore structure, soil adsorption, basal uranium/radium, salts, wind, lunar cycle, latitude and altitude have important effects on the number of radon emission. As such, it provides a scientific basis for the effective utilization of radon and prevention of its emission from soil.
英文关键词	Radon emission Earth-air The vadose zone Atmospheric pumping Mogao Grottoes The extremely arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001209063800001
WOS关键词	ATMOSPHERIC-PRESSURE ; SOIL ; TRANSPORT ; FLUX ; TEMPERATURE ; EXHALATION ; MECHANISM
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404464
推荐引用方式 GB/T 7714	Li, Hongshou,Li, Fei,Wang, Shunren. Measurement and characteristics of radon flow in an extremely arid region based on a closed-system earth-air model[J],2024,356.
APA	Li, Hongshou,Li, Fei,&Wang, Shunren.(2024).Measurement and characteristics of radon flow in an extremely arid region based on a closed-system earth-air model.JOURNAL OF ENVIRONMENTAL MANAGEMENT,356.
MLA	Li, Hongshou,et al."Measurement and characteristics of radon flow in an extremely arid region based on a closed-system earth-air model".JOURNAL OF ENVIRONMENTAL MANAGEMENT 356(2024).