| Jinshiling mining area in Chenzhou,Hunan province is selected as the research area.The data of radon concentration,? energy spectrum,magnetic method and IP method are measured in the region.According to the difference of the measured data,the effective ore-forming information is extracted,the first two kinds of data are obtained.The distribution of ore-forming halo circle is determined by measuring the size of the data.The latter two main data reflect the distribution of underground ore-forming strata and finally determine the ore-forming target area by synthesizing all kinds of data information.In this paper,the distribution of uranium mineralization is studied with the measured data of soil radon concentration.The lowest value is 66.97Bq/m,the maximum value is 97680Bq/m,the average value is 5023.14Bq/m,and the high value region is mainly in line 10,line 8,line 5 and line 9.Two abnormal peaks occurred in line 5 and line 8,respectively.According to the calculation results,the anomalous distribution range of radon concentration in the mining area is obtained,and the reliability of the fractal calculation results is fully confirmed by combining the regional geological structure data and the previous drilling exploration data.From the value of anomaly lower limit to the final uranium mineralization distribution law,through the distribution law of soil radon concentration in each survey line,the distribution section of radon high seal value can be clearly obtained,and the specific position of radon protection can be obtained.Different measures should be taken to control radon anomalies.Finally,effective ore-forming information is extracted to provide reference for uranium exploration and radiation protection in the future.Depending on the regulations on indoor environmental pollution control of civil construction engineering,when the radon concentration in the soil of civil construction site is greater than or equal to 50000Bq/m,the soil of construction site may not be used as backfill soil.When the radon concentration is greater than 20000Bq/m and less than 30000Bq/m,the anti-cracking measures are adopted in the engineering design.When the radon concentration is greater than 50000Bq/m,comprehensive building structure is adopted to prevent radon.The anomalous distribution of radon concentration is wide,and the abnormal value of radon concentration is higher than 90000Bq/m.Therefore,it is necessary to take certain radiation protection measures to the specified abnormal area,to effectively reduce the migration and release of radon,and to take effective engineering measures for the specific area.Minimize the radiation hazard of radon.And strengthen mine supervision and management,establish laws and regulations,prevent man-made damage to the mine environment,further improve the mine environment. |
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