摘要
无人机航空放射性测量技术的应用,提出无人机载伽马能谱仪现场校准的需求。原有固定于机场的“航空放射性测量模型标准装置”不宜应用于现场校准,需研制便携式标准装置,并根据无人机载伽马谱仪特点开展相应的校准方法研究。为此新研建了“便携天然放射性模型组合系统”。为确认模型组合产生伽马辐射场的均匀性,对采用6个小模块组合摆放形成的天然辐射场在垂向和水平方向的辐射特征进行测试。测试结果表明:在辐射场中心点上方50~120 cm范围内,MAP-U、MAP-Th和Map-M模型辐射场变化在5%以内,MAP-K模型由于受天然钾含量及探测器对^(40)K灵敏度限制,其变化较大,但其垂向辐射场是均匀的;水平方向均呈现以中心为原点的均匀散射分布:与中心位置相比,在100 cm×100 cm范围内的变化大致在5%以内,在200 cm×200 cm范围内的变化大致在20%以内,在300 cm×300 cm范围内的变化大致在35%以内。在辐射场中心300 cm×300 cm范围内,任意一点周边50 cm范围内的变化在5%以内。其辐射特征满足相关校准规范中计量标准均匀性的要求,可以用于无人机航放测量系统的现场校准。
The break throng of uranium exploration in new areas,new horizons and new types has accelerated the application of drone aerial radioactivity measurement technology,and brings out the demand for on-site calibration of Unmanned aerialγspectrometer.The traditional“Airborne Radioactivity Measurement Model Standard Device”fixed at the airport is not suitable for on-site calibration,a portable standard device is need to be developed to carry according to the characteristics of Unmanned aerialγspectrometer.The“portable natural radioactive combination pad system”was developed in this research.To get the uniformity of the gamma radiation field generated by the combination,we tested the vertical and horizontal radiation characteristics of the natural radiation field formed by placing six small pad combinations.The results showed that within the range of 50~120 cm above the center of the radiation field,the radiation field changes of the MAP-U,MAP-Th,and Map-M pads were within 5%.The MAP-K pad had a significant change due to the limitations of natural potassium content and detector sensitivity to ^(40)K,but its vertical radiation field was uniform;The horizontal direction presents a uniform scattering distribution with the center as the origin:compared to the central position,the variation within the range of 100 cm×100 cm was approximately within 5%;200 cm×200 cm,20%;300 cm×300 cm,35%.Its radiation characteristics meet the uniformity requirements in relevant calibration specifications and can be used for the calibration of large vehicle/airborne radiometric systems.
作者
周宗杰
高国林
杜晓立
杜一滨
武成
张岩
ZHOU Zongjie;GAO Guolin;DU Xiaoli;DU Yibin;WU Cheng;ZHANG Yan(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002 China)
出处
《世界核地质科学》
CAS
2024年第4期720-731,共12页
World Nuclear Geoscience
基金
中核集团集中研发项目(编号:物SD03-01)资助。
关键词
天然放射性模型系统
垂向及水平方向
辐射特征
均匀性
natural radioactivity combination pad system
vertical and horizontal directions
radiation characteristics
uniformity
