[核] 中子活化分析
An automatic data processing system for reactor neutron activation analysis is designed for personal computer in DOS environment.
介绍了一个在微机上建立的反应堆中子活化分析数据自动处理系统。
Neutron Activation Analysis(NAA) is a valid nuclear analytical technique, whichoccupy an important position in the chemical element analysis.
中子活化分析是一种有效的核分析技术，在微量和痕量元素分析中占有重要地位。
The influence of adsorption time and temperature on the distribution ratio of cesium between RVC and liquid sodium is investigated in the static condition by using neutron activation analysis(NAA).
以网状玻璃体碳（RVC）为吸附剂，用中子活化分析法研究了在静态条件下，吸附温度和吸附时间对铯在RVC和液态钠中分配的影响。
Meanwhile the variation and status of distribution of many elements content in the different parts of vitreous shoot were determined by neutron activation analysis technique.
利用中子活化分析技术测定了玻璃苗不同部位中的多种元素含量和分布状况及变化。
The instrumental neutron activation analysis at MNSR reactor was used for determination of 10 rare earth elements in geological samples.
本文介绍了在微型中子源堆上用仪器中子活化分析测定地质样品中10个稀土元素的方法。
The application of neutron activation analysis in research of environmental sciences which possesses such characteristics as automatically , quickly and being able to measure more elements.
简述了中子活化分析在环境科学研究中的应用，具有自动、快速、测量元素多等特点。
An INAA (Instrumental Neutron Activation Analysis) method was used to determine the abundance of rare-earth elements in 58 Late Palaeozoic coals and related rocks in North China.
采用仪器中子活化分析法（INAA）测定了华北晚古生代石炭纪-二叠纪58个煤及煤层夹矸和顶底板样品的稀土元素含量。
The contents of the major and trace elements in the Yanzhuang meteorites have been determined by instrumental neutron activation analysis(INAA).
用中子活化分析测定了新陨岩庄陨石的主量和微量元素含量。
The distribution characteristics of organo-halogens in apple and their sources were stu***d by neutron activation analysis combined with statistical analysis.
采用中子活化分析方法，研究了苹果中有机卤素污染物的分布特征。
The nickel sulfide fire assay preconcentration followed by neutron activation analysis was used to determine the platinum group elements(PGE) in rocks.
研究了镍锍试金预富集中子活化分析测定岩石样品中的铂族元素。
NAA (neutron activation analysis) and AFS (atomic fluorescence analysis), for determining mercury in human hair on the basis of the authors' experience.
中子活化分析法测汞具有灵敏、准确、无试剂空白、能作多元素同时分析的优点。
The results lay the foundation for the study of on-line neutron activation analysis system.
计算结果表明，中子活化在线分析系统的最优化慢化材料为聚乙烯。
Interactions between lanthanum and wheat roots are stu***d by a sequential extractive process combined with instrumental neutron activation analysis as well as transmission electronic microscopy.
用中子活化分析结合分级提取及透射电镜观察，研究了稀土元素镧在小麦根中的分布和存在形态。
More than 20 types of metallic elements were discovered in XC gas field, Sichuan Basin, when it was stu***d by neutron activation analysis (NAA).
利用中子活化法对四川盆地XC气田的天然气进行分析，发现其中含有20多种金属元素。
The instrumental neutron activation analysis was used to determine Cr content in chromium-rich yeast cells.
利用中子活化分析法对富铬酵母中的铬进行了测定。
The instrumental neutron activation analysis (INAA) has been performed on 27pairs of scalp hair samples for mothers and their new-born babies living in Haidian District, Beijing.
以人发作“监示器”，用中子活化法分析了27对北京海淀区产妇、婴儿发样中的汞含量，以研究汞在孕妇体内的转移及在新生儿体内的蓄积。
Neutron activation analysis for uranium in soild may delineate structures.
分析测定土壤中的铀以圈定构造。
Objective To study a method for determination of trace arsenic in cosmetics by miniature nuclear reactor epithermal neutron activation analysis.
目的探讨用微型核反应堆超热中子活化方法分析化妆品中的微量砷。
In this research, we picked out samples under microscope and lap minerals, and then got the data by neutron activation analysis.
本次研究对样品进行显微镜下的人工挑选、研磨矿物，再进行中子活化分析来得到数据。
The paper describes the results of the research of the feasibility of pureinstrument multielement reactor neutron activation analysis with short timeirradiation.
该文叙述了在原子能科学研究院重水反应堆上进行的堆中子短照纯仪器多元素活化分析的实用性和可行性的研究结果。
Twenty trace elements were found by neutron activation analysis in the nuclear reactor in 13 specimens of Jan wares collected from different localities and different historical periods.
本文利用反应堆中子活化分析法对不同产地、不同时代生产的钧瓷残片进行了分析，获得了十三块标本中的二十种元素的含量值。
Also epithermal neutron activation analysis and cyclic activation analysis had be developed on Shenzhen MNSR.
建立超热活化分析和循环活化分析方法，制备了医用放射性玻璃微球。
CFNAA Cf-252 neutron activation analysis?
锎252中子活化分析…
The design of automatic radiation and measuring system for neutron activation analysis and its realization are introduced in this paper.
介绍反应堆中子活化自动辐照检测系统的设计和实现过程。
Nickel oxide is purified and pulverization property of nickel button is stu***d. The method of determination of platinum group elements (PGE) based on neutron activation analysis (NAA) is established.
对氧化镍进行提纯，对试金扣的粉化性能进行了研究，用中子活化分析测定了地质样品中的铂族元素，全流程回收率在94％以上。
In the paragraph of the method of using artificial tracer, there is the explanation about the tracer technology of neutron activation analysis and the method of Lanthanide-DTPA tracer.
在人工示踪法中叙述了中子活化示踪沙技术和稀土元素-DTPA螯合物示踪法。
The contents of 8 rare earth elements(REEs)in chloroplasts of Brassia napus were determined by instrumental neutron activation analysis.
用中子活化分析测定了油菜叶绿体中的稀土元素含量。
中子活化分析（Neutron Activation Analysis, NAA）是一种利用中子与物质发生核反应，通过检测生成的放射性同位素特征来定量分析样品中元素种类和含量的核分析技术。其原理是将样品置于中子源（如核反应堆）中辐照，中子与靶原子核发生俘获反应，生成不稳定的放射性同位素；随后通过测量这些同位素衰变时释放的特征伽马射线能量和强度，结合已知的核反应截面数据，即可精确计算出元素的浓度。
该方法具有以下核心特点：
实际应用中需注意其局限性，例如依赖核反应堆等大型设施，且对轻元素（如碳、氧）的检测灵敏度较低。当前该技术已与X射线荧光光谱（XRF）等互补方法结合，形成多维元素分析体系。
参考文献
中子活化分析（Neutron Activation Analysis, NAA）是一种通过中子辐照样品，利用核反应生成放射性核素，并通过分析其特征辐射进行元素定性和定量分析的方法。以下是其详细解释：
中子活化分析基于核反应原理，用中子轰击样品中的稳定同位素，使其转变为放射性同位素（即“活化”）。随后通过测量这些放射性同位素衰变时释放的γ射线能量和强度，确定元素的种类和含量。其核心公式为：
$$
A = N cdot sigma cdot phi cdot (1 - e^{-lambda t})
$$
其中，( A )为放射性活度，( N )为靶核数目，( sigma )为核反应截面，( phi )为中子注量率，( lambda )为衰变常数，( t )为辐照时间。
通过结合核物理与化学分析技术，中子活化分析在痕量元素检测领域具有不可替代的优势。如需更详细案例或操作流程，可参考来源网页。
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