利用LaBr_3(Ce)伽马谱仪直接测定铀矿体中铀含量的方法  

THE APPLICATION OF LaBr_3(Ce) GAMMA RADIATION SCINTILLATION SPECTROMETER TO DIRECT DETERMINATION OF URANIUM CONTENT OF URANIUM ORE BODIES

作　　者：吴永鹏[1,2] 汤彬[2] 程建平[1] 梁永顺[2] 王哲[2] 

机构地区：[1]清华大学工程物理系,北京100084 [2]东华理工大学放射性地质与勘探技术国防重点学科实验室,江西南昌330013

出　　处：《物探与化探》2012年第3期414-417,共4页Geophysical and Geochemical Exploration

基　　金：放射性地质与勘探技术国防重点学科实验室资助项目(2011RGET04);国家自然科学基金资助项目(41074078)

摘　　要：LaBr3(Ce)闪烁体是一种综合性能优良的新型伽马射线探测器。然而,以它的能量分辨性能还不能获得含铀矿体精细伽马谱,其仪器谱反映不出与铀含量直接相关的特征峰,在这种情况下,探索一种直接获取含铀矿体铀含量的方法。采用国产LaBr3(Ce)探头对系列硬岩型放射性矿体进行测量,通过234Pam之1.001 MeV伽马特征能量以能量窗结合线性回归的相对分析法直接求取铀等目标核素的含量,获得了良好效果,对硬岩型铀矿含铀99×10-6以上相对误差不超过10.0%,对矿体中其他主要核素的定量分析误差也在8.5%以内。Lanthanum bromide scintillator,namely LaBr3（Ce）,is a new detector which has excellent comprehensive performance for detecting gamma-ray.However,LaBr3（Ce） detector fails to measure the fine structure of gamma-ray spectrum from the uranium-bearing ore body for its limited energy resolution,and the spectrum measured doesn＇t show the characteristic peaks which are directly related to uranium content.Under such circumstances,the development of a technique which can determine uranium content directly is necessary.The authors measured a series of hard rock radionuclide-bearing ore bodies using a LaBr3（Ce） probe made in China,and determined uranium content directly by relative analysis combining energy window with linear regression based on 234Pam,1.001 MeV characteristic energy and,as a result,obtained satisfactory results,which show that the relative error is less than 10.0% for uranium content over 99×10^-6,and the error is less than 8.5% for other main radionuclides.

关 键 词：LaBr3(Ce)闪烁体谱仪 含铀矿体 直接铀定量分析 能量窗分析 

分 类 号：P631[天文地球—地质矿产勘探] P632[天文地球—地质学]