广西旅游岩溶洞穴内氡及其子体浓度水平变化特征与影响因素浅析

doi:10.27045/j.1000-8187.202605006

Abstract

Abstract: Three tourist karst caves in Guangxi,namely Laojun Cave,Jiulong Cave and Jinlun Cave,all of which are solution caves,were selected for year-round monthly fixed-site monitoring of airborne radon,radon progeny,radon in water and microclimatic parameters,and effective doses under specific exposure scenarios were estimated.The results showed that the levels of airborne radon,radon progeny and radon in cave water were highest in Jiulong Cave,followed by Jinlun Cave and Laojun Cave.The annual mean airborne radon concentrations were 211.42±194.73,104.97±52.33 and 13.74±8.33 Bq/m³,respectively; the annual mean radon progeny concentrations were 135.07±124.94,66.31±37.88 and 8.93±8.22 Bq/m³,respectively;and the annual mean radon concentrations in cave water were 3.060±3.141, 0.745±0.329 and 0.338±0.076 Bq/L,respectively.Airborne radon and radon progeny concentrations in Jiulong Cave and Jinlun Cave were relatively high from June to September,while Laojun Cave remained at a low level overall.Jiulong Cave had the highest radon level in cave water and showed a relatively clear correspondence with the monthly variation of airborne radon.The analysis of microclimatic parameters indicated that airborne radon was relatively clearly related to air pressure,and airborne radon was negatively correlated with air pressure in both Jiulong Cave and Jinlun Cave.Dose estimation indicated that the effective dose was 0.000 17-0.002 5 mSv for a typical 2 h tourist visit scenario and 0.008-0.125 mSv for a 100 h cumulative occupancy scenario.The results may provide a reference for radon environmental monitoring and radiation protection management in tourist karst caves.

Key words: karst cave, ²²²Rn, radon progeny, radon in water, effective dose

CLC Number:

X591

WU Jiacheng, WU Guohui, YANG Hang, LUO Jizun, ZHONG Jie, YU Yang. Variation characteristics and influencing factors of radon and radon progeny levels in tourist karst caves in Guangxi,China:A preliminary analysis[J].RADIATION PROTECTION, 2026, 46(5): 427-436.

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Variation characteristics and influencing factors of radon and radon progeny levels in tourist karst caves in Guangxi,China:A preliminary analysis

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