γ谱法测定核设施环境土壤中^(235)U、^(238)U  

Determining Uranium-235 and Uranium-238 in Nuclear Facility Environment Soil with Gamma Spectrometry

作　　者：李庆光[1] 杨秀玉[1] 葛琴 LI Qing-guang;YANG Xiu-yu;GE Qin(Company Limited,CNNC,Lanzhou 732850,China)

机构地区：[1]中核四〇四有限公司,兰州732850

出　　处：《核电子学与探测技术》2021年第2期305-308,共4页Nuclear Electronics & Detection Technology

摘　　要：通过土壤样品^(235)U、^(238)U比活度分析、分析方法比对和矿石、土壤样品检测,验证了γ能谱法在铀测定中的应用。实验表明:^(235)U比活度可由185.7 keV特征峰求得,需扣除2261^的186.2keV峰干扰;^(238)U比活度可由92.6 keV特征峰求得,需扣除钍系和锕系的93.35 keV峰干扰;^(238)U与^(235)U含量比值与天然铀^(238)U与^(235)U比活度比值相符时,可判定样品中铀来源为天然铀,由Z3SU或^(238)U的γ能谱测量结果给出天然铀含量。The application of Gamma Spectrometry in uranium determination was verified through the analysis of specific activity of 235 U and 238 U in soil samples,the comparison of analytical methods and the detection of ore and soil samples.The experimental results show that Uranium-235 specific activity is obtained by 185.7 keV gamma ray,but must subtract Radium-226186.2 keV gamma ray interference;Uranium-238 specific activity is obtained by 92.6 keV gamma ray,but must subtract Thorium and Actinide series 93.4 keV X rays interference.When the ratio of Uranium-238 specific activity to Uranium-235 specific activity in sample is consistent with natural Uranium,the uranium source in the sample can be determined to be natural uranium and the natural Uranium content can be obtained through Uranium-235 or Uranium-238 gamma spectrometry results.

关 键 词：Γ能谱法 特征γ射线 ^(235)U ^(238)U 

分 类 号：X830.3[环境科学与工程—环境工程]