High 222Rn concentrations and dynamics in Shawan Cave, southwest China

Wang, Yanwei; Luo, Weijun; Zeng, Guangneng; Wang, Yan; Yang, Hanling; Wang, Meifang; Zhang, Lin; Cai, Xiaobin; Chen, Jia; Cheng, Anyun; Wang, Shijie

doi:10.1016/j.jenvrad.2018.12.029

Cited by 24 publications

(18 citation statements)

References 35 publications

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“…It is common to find in literature, cycles of indoor gas accumulation associated with a higher degree of insulation from the external atmosphere during the spring-summer period, followed by cycles of degassing during the autumn-winter period. However, this is not a standard rule, as the distribution of such cycles may vary depending on the morphology of the cave [ 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Sàinz

Fábrega

Rábago

et al. 2022

IJERPH

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A study is presented on rapid episodes of air exchange in the Polychrome Room of the Altamira Cave (Cantabria, Spain) using continuous monitoring of radon and CO2 tracer gases, as well as environmental parameters such as internal and external air temperature. For this, criteria have been developed to carry out an inventory of these types of events during the 2015–2020 period. Most of the degassing-recharging events occur over several hours or days, especially during spring and autumn. This means that the room can be significantly ventilated during these short periods of time, posing an exchange of energy and matter with potential impact in the preservation of the rock art present inside. In addition, the hypothesis that temperature gradients between the internal and external atmosphere is one of the main factors that induces degassing has been tested. To this end, correlation analysis has been carried out between the different magnitudes involved in this study, such as radon and CO2 concentrations, and air temperature gradients. A total of 37 degassing-recharging events have been analyzed for the 5 year studied period. The distribution of the duration of the events have been described, as well as that of the correlations between the degassing and recharge stages of each event, showing significant values of r coefficients for the correlation with temperature gradients between the internal and external atmosphere.

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Section: Introductionmentioning

confidence: 99%

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Sàinz

Fábrega

Rábago

et al. 2022

IJERPH

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“…Soon after that high concentration of Radon in the region of Shawan Cave in southwest of china were continuously monitored by Yanwei Wang et al using the RAD7 radon detector (Y. Y. Wang et al, 2019).…”

Section: Summary Of the Resultsmentioning

confidence: 99%

Review of low-level background radioactivity studies conducted from 2000 to date in people Republic of China

Khan

Sun

Lewis

2020

Journal of Radiation Research and Applied Sciences

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About 87% of the total dose received by the general public is due to naturally existing radioactive nuclides. Long-term exposure to the relatively long half-life radioactive elements (including Uranium, Thorium, and Potassium) and their decay products pose severe health threats to the population including lung cancer. The related available data has been collected from numerous studies conducted in China over the last two decades. Several studies have been conducted to determine the radioactive content of primordial Uranium-238, Thorium-232, Radium-226, Potassium-40, and anthropogenic Cesium-137 radionuclides in building materials, soil samples from cultivated lands, fertilizers used for reformation of soil, ash (fly, bottom) from coal fired power plant, water for irrigation and dietary items by means of High Purity Germanium HPGe or Sodium Iodide NaI (Tl) detectors. The radium equivalent activity ðRa eq Þof all the studied materials was found to be less than 370 Bq/kg except in soil from Baoji coal fired power plant (CFPP), building materials from Weinan, Xing, Fly ash from Xiangyang and coal-bearing strata from East china. The glazed tiles from Guandong, Xhaanxi, Shandong, and Zhejiang with Ra eq > 370 Bq/kg, Gamma Index ðI γ Þ > 6, corresponding to a γdose rate higher than the permissible limit of 1 mSv/yr. The volume of the gathered data is vast and scattered, and it is required to compile all data regarding the natural as well as man-made radioactivity in China. The main goal of this paper is to establish a nationwide baseline data on natural radioactivity levels by reviewing and compiling the outcomes of the conducted studies within the entire country.

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“…However, some studies have shown that in the mixed dissolution process caused by water-rock interactions in karst pores, infiltrated CO 2 increases more than in soil, acting as another source of cave CO 2 . Similarly, cave system CO 2 is mixed with the atmosphere due to the intervention of external environmental changes and ventilation effects, resulting in CO 2 accumulation or dilution effects in the cave (De Freitas et al, 1982;Lang et al, 2015;Zhang et al, 2018;Wang et al, 2019). In recent years, research on vertical CO 2 migration in karst cave systems has mainly investigated soil-cave CO 2 responsibility (Thaysen et al, 2014), the response of groundwater hydrochemical characteristics to overlying soil changes (Cao et al, 2020), and the influence of external environmental changes on soil-to-cave CO 2 transfer.…”

Section: Introductionmentioning

confidence: 99%

Study on vertical migration of CO₂ in a karst cave system

et al. 2022

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CO 2 is an important driving force in karstification. Studying the variation characteristics of CO 2 in each zone of a karst cave system during different seasons might contribute to revealing its migration path and to further exploring CO 2 sources in caves. To this end, we monitored the soil, cave drip water, and cave air CO 2 in Mahuang Cave, SW China. We analyzed the vertical migration characteristics of CO 2 based on the carbonic acid equilibrium system theory and the stable isotopes of carbon through statistical analysis. The results show the following: (1) There are obvious seasonal changes in CO 2 in each zone of Mahuang Cave, generally indicating high rainy season and low dry season characteristics. (2) The CO 2 in Mahuang Cave is mainly supplied by the soil, bedrock, and the external atmosphere. The rainy season has plentiful rainfall, and the CO 2 in the cave is mainly derived from soil CO 2 . In the dry season, with lower temperature and little rain, cave CO 2 is mainly attributed to the external atmosphere, brought by the ventilation effect, and carbon in the bedrock. (3) Carbonate precipitation in Mahuang Cave is dominant throughout the year. The seepage migration process and carbonate precipitation are controlled by the soil "CO 2 effect" and drip water type.

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High 222Rn concentrations and dynamics in Shawan Cave, southwest China

Cited by 24 publications

References 35 publications

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Review of low-level background radioactivity studies conducted from 2000 to date in people Republic of China

Study on vertical migration of CO₂ in a karst cave system

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High 222Rn concentrations and dynamics in Shawan Cave, southwest China

Cited by 24 publications

References 35 publications

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Use of Radon and CO2 for the Identification and Analysis of Short-Term Fluctuations in the Ventilation of the Polychrome Room Inside the Altamira Cave

Review of low-level background radioactivity studies conducted from 2000 to date in people Republic of China

Study on vertical migration of CO2 in a karst cave system

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Study on vertical migration of CO₂ in a karst cave system