地形对砂岩型铀矿氡气测量的干扰作用及其修正方法

The terrain interference to radon measurement in sandstone-type uranium deposit and its correction method

砂岩型铀矿地面氡浓度与地形的相关性较为密切,地形改造作用破坏了氡浓度的客观形态。通过探讨地形干扰作用的起因,并结合地面氡、镭的实测数据分析,认为地表的氡异常主要是由深部纳米级的^(238)U和^(226)Ra经接力传递作用迁移至地表后衰变形成。同时为了抑制地形的干扰,采用子区中位数衬值滤波法对氡浓度数据进行处理,结果显示在保留高异常的基础上,能够增强弱异常信息,以及发现新的矿致异常,取得了较好的应用效果。

There exists intimate relationship between the ground radon concentration and the terrain,and the transformation effect of the terrain can destroy the objective form of radon concentration. Through discussing the cause of the terrain interference effect in combination with an analysis of the measured ground radon and radium data,it is considered that the surface radon anomaly is mainly formed by the decay of nanometer ^（238）U and ^（226）Ra which is transported to the surface by relay transmission. In order to suppress the terrain interference,the authors adopted the subarea median contrast filtering method for radon concentration data processing,and the results show that,on the basis of retaining high anomalies,the weak abnormal information can be enhanced,and new ore-related anomalies can be delineated,which suggests that good application effect can be achieved.