Abstract
Radon is found in various rocks as a naturally occurring radioactive gas. It is crucial to estimate the radon emission characteristics of different in situ rocks in the pre-mountain fracture zone of the northern foot of the Qinling Mountains in China for radiation risk prevention, as several inhabitants occupy the area. This paper analyzes the pore structure and radon gas emission characteristics of granite, gneiss, limestone, and sandstone by low-temperature nitrogen adsorption (LTNA) test, nuclear magnetic resonance (NMR) test, scanning electron microscope (SEM) test, and radon gas (Rn-222) measurements. Based on the findings of the study, the order of radon emission rate from high to low is granite, gneiss, limestone, and sandstone, and the volume of micropores (r < 2 nm) is positively correlated to the radon emission rate. Furthermore, mesopores (2 nm < r < 50 nm) are the major components of rock pore structure. The sandstone and limestone show a negative correlation of radon emission rates with the mesopore fractal dimensions (based on LTNA and NMR). The radon emission is inhibited for complex mesopore structures. The results of the study can help to understand the mechanisms influencing the radon emission process in rocks and to guide assessments of the radon potential in the region and radiation risk in rocks.
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The data used to support the findings of this study are available from the corresponding author upon request.
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This research was supported by the Opening Project of Geological Research Institute for Coal Green Mining (Grant No: DZBZ2021Z-06; DZBZ2022Z-02).
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All authors contributed to the study conception and design. Shutao Zhou and Qiang Sun analyzed data, produced figures and tables, and drafted the manuscript. Qiang Sun, Pengfei Li, Hao Huang, Zhongji Tian, Enyuan Zhang refined the manuscript and provided additional interpretation of the findings.
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Zhou, S., Sun, Q., Li, P. et al. Study on the pore structure and radon emission characteristics of typical rocks in the Lintong area. Bull Eng Geol Environ 82, 251 (2023). https://doi.org/10.1007/s10064-023-03285-2
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DOI: https://doi.org/10.1007/s10064-023-03285-2