无人机航空γ能谱测量在地形高起伏地区异常查证中的应用

Application of the unmanned aerial vehicle-airborne gamma-ray spectrometrysystem to follow-up geochemical surveys in high-relief areas

针对地形高起伏地区大比例尺放射性矿产勘查的需要,研制了基于小体积NaI(Tl)晶体的航空伽马能谱探测器,与F-120无人直升机集成了航空γ能谱测量系统。利用该系统在南方某地区开展了铀矿异常检查测量,与地面γ能谱测量结果比对,两者的高异常区域位置、形态基本一致,且前者的异常形态更细致,特别是与铀含量直接相关的铀道数据对区内已知铀矿点反应更明显,数据质量更优。据此认为,无人机航空γ能谱测量有望替代地形起伏大的地区铀矿异常查证工作中的现有地面γ能谱测量。

In response to the need for large-scale exploration of radioactive minerals in high-relief areas,this study developed an airborne gamma-ray spectrometer based on small-sized NaI(Tl)crystals,which was integrated with the F-120 unmanned aerial vehicle(UAV)to form an airborne gamma-ray spectrometry(AGRS)system.The UAV-AGRS system was applied to the follow-up geochemical survey of uranium deposits in a certain area of South China.The survey results show roughly consistent locations and morphologies for high-anomaly zones with the ground gamma-ray spectrometry results.Moreover,the results of this study exhibit more detailed anomaly morphologies,and more significant responses of uranium content-related uranium channel data to known uranium occurrences in the study area,suggesting superior data.Therefore,the UAV-AGRS system shows promising potential as an effective alternative to ground gamma-ray spectrometry for the follow-up geochemical survey of uranium deposits in high-relief areas.