活性炭测氡法在盐池县小马鞍山地区的应用  

Application of Activated Carbon Radon Measurement in Xiaoma’anshan Area of Yanchi County,Ningxia

作　　者：马杰 史保胤 谢非 王赕 叶旭阳 芮婷 杜鹏龙 员文强 张文剑 MA Jie;SHI Baoyin;XIE Fei;WANG Dan;YE Xuyang;RUI Ting;DU Penglong;YUAN Wenqiang;ZHANG Wenjian(Ningxia Nuclear Geological Survey Institute,Yinchuan,Ningxia 750021,China)

机构地区：[1]宁夏回族自治区核地质调查院,宁夏银川750021

出　　处：《世界核地质科学》2023年第3期815-824,共10页World Nuclear Geoscience

基　　金：宁夏自然科学基金项目(编号:2022AAC03659)资助。

摘　　要：盐池县小马鞍山地区具有较好的铀成矿条件,但地表90%以上的面积被第四系所覆盖,运用常规的地质物探地面调查测量方法,获得的找矿信息甚微,导致找矿成效不明显。选择在小马鞍山地区开展活性炭吸附测氡,在40、80和120 cm不同深度探坑测量氡气浓度,并进行地面伽马照射量率测量,建立了氡气浓度随探坑深度变化的线性关系,初步总结出氡气浓度与地面伽马照射量率之间的变化相关性规律。结果表明:研究区氡气浓度随探坑深度的增加,氡气浓度增加变化特征显著,地面伽马照射量率普遍较低,基本为第四系背景值,去除地表放射性核素铀、镭对氡气浓度的贡献值,研究区氡气主要为地下逸散扩散而来,表明研究区地下赋存较强的辐射源(体),初步判定研究区可能存在较好的隐伏铀矿化体。Xiaoma’anshan area of Yanchi county is believed good in uranium mineralization conditions,but over 90%the land surface is covered by the Quaternary sediments,and little uranium prospecting information and results were obtained by conventional geological and geophysical ground survey.In this paper,activated carbon Radon Measurement was used for uranium exploration.The radon concentration and ground gamma intensity at the depths of 40,80 and 120 cm were measured by activated carbon adsorption in Xiaoma’anshan area.The linear relationship between radon concentration and ground gamma intensity was established,and the correlation law between radon concentration and ground gamma intensity was summarized.The results show that the radon concentration in the study area increased significantly with the increase of the probe depth.This surggests that there may be a good uranium mineralized body beneath the detecting pits in the study area.The low intensity of the gamma exposure rate of the land surface is basically from the Quaternary background value.After removing the contribution value of surface radionuclide and radium to the measured radon concentration in the pit,the measured high radon concentration is mainly from the dispersion and diffusion of underground anomaly,indicating that there are strong radiation sources(bodies)in the underground of the study area.

关 键 词：小马鞍山 活性炭吸附测氡 氡气浓度 保安群 铀矿化体 

分 类 号：P619.14[天文地球—矿床学] P632[天文地球—地质学]