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Dependence of radon levels in Postojna Cave on outside air temperature

机译：Postojna洞穴中ra含量与外界气温的关系

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摘要

Postojna Cave is the largest of 21 show caves in Slovenia. The radon concentration there was measured continuously in the Great Mountain hall from July 2005 to October 2009 and ranged from about 200 Bq m-3 in winter to about 3 kBq m-3 in summer. The observed seasonal pattern of radon concentration is governed by air movement due to the difference in external and internal air densities, controlled mainly by air temperature. The cave behaves as a large chimney and in the cold period, the warmer cave air is released vertically through cracks and fissures to the colder outside atmosphere, enabling the inflow of fresh air with low radon levels. In summer the ventilation is minimal or reversed and the air flows from the higher to the lower openings of the cave. Our calculations have shown that the effect of the difference between outside and cave air temperatures on radon concentration is delayed for four days, presumably because of the distance of the measurement point from the lower entrance (ca. 2 km). A model developed for predicting radon concentration on the basis of outside air temperature has been checked and found to be successful.
机译：Postojna洞穴是斯洛文尼亚21个表演洞穴中最大的。从2005年7月至2009年10月，在Great Mountain大厅内对there的浓度进行了连续测量，范围从冬天的约200 Bq m-3到夏天的约3 kBq m-3。由于外部和内部空气密度的差异，所观测到的seasonal浓度的季节性模式受空气运动的控制，空气密度主要受气温控制。该洞穴表现为一个大烟囱，在寒冷时期，较热的洞穴空气通过裂缝和裂缝垂直释放到较冷的外部大气中，从而使低ra水平的新鲜空气流入。在夏季，通风最少或反向，空气从洞穴的较高开口流向较低开口。我们的计算表明，外界温度和洞穴空气温度之间的差异对concentration浓度的影响被延迟了四天，这大概是因为测量点距下部入口的距离（约2 km）。已开发出一种可根据外界气温预测ra浓度的模型，并证明是成功的。

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