X射线荧光分析中基本参数法的应用

本文使用基本参数法,对合金钢样品不经化学处理,不使用参考标准,样品在~(238)Pu同位素源激发的Si(Li)探测器组成的X射线荧光谱仪上进行测量,将测量结果送入同多道分析器联机的EMG666微机上进行计算,最后打印出结果。文中对入射角的变化、一次荧光效应、二次荧光效应和散射效应进行了研究;对核电站的合金钢样进行了分析,用标准样品检验方     

X射线荧光分析中基本参数法的应用

文章使用基本参数法,对合金钢样品不经化学处理,不使用参考标准,样品在同位素源激发的Si(Li)X射线荧光谱仪上进行测量,将测量结果送入同多道联机的EMG 666微机上进行计算,最后打印出分析结果。文中对入射角的变化,一次荧光效应和二次荧光效应,散射效应进行了研究,并对合金钢样进行了分析。用标准样品检验,表示分析准确度的相对误差小于±3%;表示方法精密度的相对偏差小于±6%。     

基本参数法X射线荧光无损分析铅黄铜中铜和锌

应用能量色散X射线荧光分析仪对系列铅黄铜合金标样进行能谱测量,根据基本参数法原理,获取了方法中所需的质量吸收系数()、激发因子(E)等关键参数,编写计算程序,对标样中铜、锌含量进行了分析。结果表明,基本参数法能克服铜和锌元素间的吸收增强效应,该方法测量铅黄铜合金中铜和锌的含量范围分别为54%–64%、33%–45%,对铜、锌的相对标准偏差(n 10)分别为0.10%、0.15%。     

X射线荧光光谱分析法同时测定化探样品中多组分的含量

采用粉末压片制样法,利用PANalytical Axios型波长色散X荧光光谱仪同时对化探样品中的Fe2 O3、Al2 O3、Cr、Co、Ni、Cu、Zn、Pb等36种主、次和痕量组分进行测定.采用基本参数法,结合PH模式的经验系数法校正光谱干扰和集体效应.用国家标准物质做检验,测量结果与标样认定值吻合,用国家一级标准...     

能量色散X荧光分析系统软件设计

本文介绍的是新研制的能量色散X荧光分析软件。本软件采用树状结构,具有操作方便、运行速度快、功能丰富、容错能力强等特点。本软件实现了X荧光分析的数据采集、谱的解析和基体校正等功能,其效果达到了国际上同类产品的水平。     

一种便携式能量色散X射线荧光分析仪的设计

研制了一种便携式能量色散X射线荧光分析仪(EDXRF)。激发源采用国产小口径Mo靶X线管,以变频技术设计了配套的高压电源和灯丝电源,探测器为电制冷半导体探测器。通过元素Cu、Zn、Ni、Pb的能谱测量,研究了该分析仪的检测性能和能量定标曲线,并且从理论上分析了其最佳元素分析范围。     

能量色散X射线荧光光谱仪现状及其发展趋势

能量色散X射线荧光光谱仪被广泛用于许多部门和领域,已成为理化检测、野外现场分析和过程控制分析等的重要工具.文中介绍了现代能量色散X射线荧光光谱仪主要性能指标,综述了能量色散X射线荧光光谱仪的硬件和软件研制现状,简述了多种新型的能量色散型X射线荧光光谱仪,并对其发展趋势与前景进行了展望.     

能量色散X射线荧光分析现场测定地质样品中W钨含量

采用IED - 2000能量色散X射线荧光仪测量化探样品,并对获得的仪器谱进行散射本底扣除和直接解调谱线重建,获得W的Lα特征X射线全能峰净峰面积,从而实现W含量的测量.对同一批化探样品进行室内波长色散X射线荧光分析和野外X射线荧光分析,其分析结果对比表明对能量色散X射线荧光仪进行谱线处理后,可以在野外现场对W元素实现...     

X射线荧光测井仪系统研制

分析了X射线荧光测井仪的测量原理、关键技术和工程设计难点,并在此基础上,设计实现了能用于野外钻探现场的X射线荧光测井仪,最后给出实测对比数据,证明了本测量系统能用于实际的地质勘察工作.     

能量色散X射线荧光法测定涂钯硅藻土中的钯含量

在涂钯硅藻土样品中定量加入内标元素Mo和王水,制成分析试样,用能量色散X射线荧光（EDXRF）法测定钯含量。该方法可测定钯含量为5％－50％范围的涂钯硅藻土样品,方法快速、简便、其相对标准偏差优于1％,回收率98％－108％。     

Use of MCNP code in energy dispersive X-ray fluorescence

Monte Carlo simulations enable us to improve the applicability of analytical techniques based on emission of characteristic radiation. In particular, the MCNP4C2 code was tested for interpretation of measured data obtained with the use of energy dispersive X-ray fluorescence analysis. This paper describes MCNP outputs and compares them with the results of analytical calculations or experiments. Then the application of Monte Carlo simulations to the prediction of measurement results is shown, and the MCNP results are verified.     

Elemental analysis of mining wastes by energy dispersive X-ray fluorescence (EDXRF)

An energy dispersive X-ray fluorescence (EDXRF) tri-axial geometry experimental spectrometer has been employed to determine the concentrations of 13 different elements (K, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Rb, Sr and Pb) in mine wastes from different depths of two mine tailings from the Cartagena-La Union (Spain) mining district. The elements were determined and quantified using the fundamental parameters method. The concentrations of Cr, Ni, Cu, Zn and Pb were compared to the values from the European and Spanish legislation to evaluate the environmental risk and to classify the wastes as inert wastes or as wastes that have to be control land-filled. The results obtained demonstrate that these wastes can be considered as inert for the considered elements, apart from the concentration levels of Zn and Pb. Whilst Zn slightly overpasses the regulatory levels, Pb mean value exceeds three to six times the value to be considered as Class I potential land-filling material.     

用能量色散X荧光法测定磁盘磁层厚度

用放射源~(238)Pu激发磁盘磁层中铁的特征X荧光来测定磁层厚度,具有快速、非破坏、精度高等优点。本文叙述测量原理、探测装置考虑、干扰因素的排除及数据处理。测定厚度范围为0.5—15μm。当厚度大于1μm时,测量精度好于5％。     

Towards an online energy dispersive X-ray fluorescence analytical system for iron ore grade evaluation

Having studied some of the factors that influence the results of iron grade analysis during the iron ore production process, we established an online analytical system based on energy dispersive X-ray fluorescence. The system can determine the iron ore grade within 5 minutes. Compared with similar systems, this online analytical system has the ability to deal with the problems of poor sampling, poor on-site conditions for online iron ore analysis, variation in the moisture content of samples, the matrix effect and spectral drift. The system has been applied to iron ore grade evaluation in the Panzhihua Iron and Steel Company, China. Practical tests illustrated that the system can effectively improve iron ore grade evaluation.     

蒙特卡罗方法在X荧光无损分析中的应用

探讨了X射线荧光分析(XRF)初测和蒙特卡罗模拟计算相结合的无损定量分析方法,分析了成都市空气飘尘的铅浓度。分析结果表明成都市空气飘尘铅平均质量浓度是1．24μg/m^3,与有关文献报道的用原子吸收光谱仪测定结果(1．80μg/m^3)相比无显著差异;绘制了Si(Li)探测器相对探测效率曲线;讨论了影响探测效率的几个主要因素,并给出了定量估计。     

蒙特卡罗方法在X射线荧光分析中的一些应用

本文给出了荧光过程的蒙特卡罗模拟,着重考虑了几种散射过程对特征X射线强度的影响。对几 种纯元素,计算了单位辐射下特征X射线的强度,与实验值取得了较好的一致。     

In situ characterization of ancient plaster and pigments on tomb walls in Egypt using energy dispersive X-ray diffraction and fluorescence

A portable type of energy dispersive X-ray diffraction and fluorescence (ED-XRDF) spectrometer was developed, whose operation mode is completely different from that of an X-ray diffractometer commercially available. The former is operated in energy dispersive mode but the latter in angle dispersive mode. The performance of the ED-XRDF spectrometer was tested in the field, i.e. in the tomb of Amenhotep III, built in 1364 B.C. or earlier in Egypt. The crystal structure and chemical composition of ancient plaster and pigments were successfully determined in the field using the spectrometer. The same areas investigated by the ED-XRDF spectrometer were also examined with an optical microscope. The plaster is found to be composed of anhydrite, calcite and quartz. White and yellow pigments were identified as huntite and orpiment, respectively. Egyptian blue and goethite were found in the green colored parts.     

全反射X射线荧光分析

综述了全反射X射线荧光分析技术的基本原理，装置及特点，介绍了全射X射线荧光分析技术的应用及其前景。     

波长色散X射线荧光光谱法快速测定铂铑合金中铂和铑的含量

采用波长色散X射线荧光(X-ray fluorescence,XRF)光谱法对铂铑合金中Pt和Rh的含量进行测定,建立了一种Pt和Rh的分析测量方法。实验设定波长色散XRF光谱仪激发电压为60 k V、电流为50 m A,采用100mm的黄铜滤光片、间距300mm的准直器、PX10分光晶体和闪烁探测器对Pt的La线和Rh的Ka线进行分析测量;为消除样品杯罩产生的干扰使用直径27 mm的准直器面罩。应用经验系数法对基体效应进行了校正,建立了Pt和Rh的校正曲线,其K值和RMS值(均方根偏差)较小,线性相关性较好。分析结果表明,Pt和Rh的相对误差分别小于0.09%和0.54%,相对标准偏差分别为0.11%和0.17%(n=10),检出限分别为208mg·g~(-1)和37mg·g~(-1),该方法能准确可靠地测定铂铑合金中Pt和Rh的含量,单样分析时间仅需74 s。将该方法应用到铂铑合金配制生产过程中,Pt和Rh的测定结果与配方值的相对误差分别小于0.06%和0.20%。在铂铑合金稀释熔炼中,对稀释后样品的Rh含量进行测量,其测量结果与计算值的相对误差低于0.29%。该方法能够满足大批量铂铑合金样品的分析需求,为生产实践提供准确可靠的科学数据。