加速器质谱法测量含铀微粒中铀同位素比的方法研究  

Methodological Study for AMS Measurement of Uranium Isotope Ratio in Uranium Particle

作　　者：王琛[1] 董克君[2] 赵兴红[1] 何明[2] 张燕[1] 姜山[2] 赵永刚[1] 李力力[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]中国原子能科学研究院核物理研究所,北京102413

出　　处：《原子能科学技术》2016年第4期732-736,共5页Atomic Energy Science and Technology

摘　　要：准确测定含铀微粒同位素比在核保障中有重要的应用价值。本文采用将含铀微粒溶解并加入高纯Fe粉烘干的方法制样,采用中国原子能科学研究院的HI-13串列加速器质谱测量靶样中的同位素比。通过对CRM铀系列同位素标准样品的分析表明,该方法可测定高于10^(-5)的^(236)U/^(238)U同位素比;对于^(235)U/^(238)U同位素比在10^(-4)~10^(-1)范围内的含铀微粒,^(235)U/^(238)U同位素比相对扩展不确定度均小于10%。The accurate determination of uranium isotope ratio in uranium particle is essential for nuclear safeguards. Uranium particles were first dissolved, and then the solution was dropped in high purity iron powder and was dried and prepared for the target of accelerator mass spectrometry （AMS） in this paper. The target sample was measured by HI-13 AMS system at China Institute of Atomic Energy （CIAE）. The certified reference materials （CRM） for uranium particles isotope ratios were analyzed. The results demonstrate that the method can be used for measuring the ^236U/^238 U isotope ratio above 10^-5 , and ^235U/^2asU isotope ratio of 10^-4-10^-1 can be measured with better than 10 % relative expanded uncertainty.

关 键 词：加速器质谱 含铀微粒 ^236U/^238U同位素比 ^235U/^238U同位素比 

分 类 号：TL275[核科学技术—核燃料循环与材料]