主流含铀微粒分析方法能力对比  

Comparison of the Capability of Mainstream Uranium Particle Analysis Methods

作　　者：李少伟[1] 沈彦[1] Li Shaowei;Shen Yan(China Institute of Atomic Energy,P.O.Box275(26),Beijing 102413,China)

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

出　　处：《广东化工》2024年第24期8-11,共4页Guangdong Chemical Industry

摘　　要：环境擦拭样品微粒分析是核保障中的一项重要的分析内容,在探知未申报核活动领域内发挥着重要的作用,经过近30年发展,目前国际上通用的微粒分析技术路线有两种:SIMS法和FT-TIMS法,本文比较两种主流微粒分析方法测量铀微粒同位素比的优劣点,结果表明:在微粒回收方面,两种分析方法的微粒回收效率均大于45%,如排除棉布残余影响,两者回收效率相差不大;在质控难易方面,FT-TIMS法234U、236U的本底基本小于0.3CPS,235U本底基本小于2 CPS,238U本底基本小于25 CPS,SIMS法234U、236U、238U的本底基本小于0.5CPS;235U本底基本小于2.3 CPS,两者本底的主要差别在238U方面,对实际样品分析影响不大;在微粒同位素分析方面,两者主同位素比分析结果相差不大,TIMS结果略优于SIMS,对于234U/238U,TIMS测量内精度及准确度均优于SIMS法,对于236U/238U,由于SIMS分析收到UH峰干扰,TIMS分析的内、外精度、准确度均优于SIMS法。Particle analysis of environmental swipe samples is an important analytical content in nuclear safeguards,playing an important role in exploring undeclared nuclear activities.After nearly 30 years of development,there are currently two internationally used particle analysis technology routes:SIMS method and FT-TIMS method.This article compares the advantages and disadvantages of the two mainstream particle analysis methods in measuring uranium particle isotope ratios,and the results show that in terms of particle recovery,The particle recovery efficiency of both analysis methods is greater than 45%.If the residual influence of cotton fabric is excluded,the recovery efficiency of the two methods is not significantly different;In terms of quality control difficulty,the background of FT-TIMS method for 234U and 236U is generally less than 0.3 CPS,235U is generally less than 2 CPS,238U is generally less than 25 CPS,and SIMS method for 234U,236U,and 238U is generally less than 0.5 CPS;The 235U background is basically less than 2.3 CPS,and the main difference between the two backgrounds is in the 238U aspect,which has little impact on the actual sample analysis;In terms of particle isotope analysis,there is not much difference between the main isotope ratio analysis results of the two methods.TIMS results are slightly better than SIMS.For 234U/238U,TIMS measurement has better internal accuracy and accuracy than SIMS method.For 236U/238U,it is better than SIMS analysis in receiving UH peak interference.TIMS analysis has better internal and external accuracy and accuracy than SIMS method.

关 键 词：铀微粒 二次离子质谱 裂变径迹-热电离质谱 

分 类 号：TL271[核科学技术—核燃料循环与材料]