摘要
通过对广西、湖南４个洞穴空气中的氧及其子体的初步研究发现，桂林地区的洞穴氧含量与世界上其它一些洞穴相比普遍较低，仅为０．０４６～０．１６８ｗＬ（或３３９～６２０Ｂｑ／ｍ￣３），而世界上洞穴最高浓度达４１．９７ＷＬ。这可能与桂林地区碳酸盐岩地层中的低背景值有关。同时发现，洞穴内空气流动程度是决定洞内氧及其子体聚集量的主要因素。在同一洞穴中，洞口附近的氧浓度要比深部低；而在放射性元素高背景区的万华岩中，由于它为一地下河型洞穴，且有三个进出口，洞内空气流动程度较高，故氧的浓度反而很低，仅为７８～８８Ｂｑ／ｍ￣３（０．０１１～０．０１２ＷＬ）。
On the basia of the preliminary study of radon in 4 caves in Guangxi and Hunan,we haveunderstood that the radon and its daughter concentrations in the caves of Guilin are lowerthan those in similar caves in the world,generally from 339 Bq/m￣3 to 620 Bq/m￣3 or from0.064 to 0.168 WL.The fact may be related to the geological environment of Guilin.In addi-tion,it is found that the internal air circulation may control the radon accumulation in thecaves.In a cave,the radon concentrations near the entrance are lower than those in the deeppart.In the Wanhua Cave,although the area with high background of radioactive elements,the radon concentrations are much lower,and only 78-88 Bq/m￣3(0.011-0. 012 WL)becauseof the good air circulation condition.
出处
《中国岩溶》
CAS
CSCD
北大核心
1995年第4期345-351,共7页
Carsologica Sinica
关键词
岩溶洞穴
氡
分布特征
桂湘地区
氡子体
karst cave
radon and its daughter concentrations
distribution characteris-tics
Guangxi and Hunan.
