薄膜法X射线荧光测量中样品检测位置及防护铅板内衬材料的选择研究

发布时间：2018-06-26 02:16

本文选题：光谱学 + XRF　；参考：《光谱学与光谱分析》2015年01期

【摘要】：(1)以型号316不锈钢金属板为研究对象,对薄膜法X射线荧光光谱测量中,样品检测位置的选择进行研究,确定了最佳的样品检测位置为样品距离X射线管和探测器水平基线1cm处,并且与X射线管和探测器水平基线成16°角度。(2)以工业环境空气重金属污染物Pb,Cd,Cr为主要分析对象,在有铅板防护情况下进行薄膜法X射线荧光光谱测量研究,发现X射线会穿透样品薄膜而继续激发防护铅板,使得滤膜背景光谱中有较强的铅谱线干扰,会对实际样品中铅元素的测量产生影响。在薄样和防护铅板之间加上一层隔离材料,可有效避免防护铅板中铅谱线对样品测量产生的干扰。(3)以型号316不锈钢、黄铜、铝材、紫铜和聚四氟乙烯几种硬质隔离材料作为铅板内衬材料进行选择研究,结果表明:紫铜的X射线荧光光谱中所含元素的谱线最少,谱图中没有出现重金属Cr,Cd,Pb的谱峰,并且能量较高部分靶材散射光谱强度较弱,对实际样品中重金属元素Cr,Cd和Pb的测量不会产生干扰,作为铅板的内衬金属材料可以避免防护铅板中铅元素谱线的干扰,是最佳的薄膜法X射线荧光光谱分析中铅板的内衬金属材料。该研究为组装及搭建便携式大气及水体重金属X射线荧光光谱分析仪提供了重要的理论依据。
[Abstract]:The main contents are as follows: (1) taking the type 316 stainless steel metal plate as the research object, the selection of the sample detection position in the thin film X-ray fluorescence spectrum measurement is studied. The best sample detection position was determined as the sample distance from the X-ray tube and the detector horizontal baseline 1cm, and at an angle of 16 掳with the X-ray tube and detector horizontal baseline. (2) the industrial air heavy metal pollutant Pbbcdcdcr was used as the main analytical object. In the case of lead plate protection, the X-ray fluorescence spectra were measured by thin film method. It was found that X-ray would penetrate the sample film and continue to excite the protective lead plate, resulting in a strong lead line interference in the background spectrum of the filter membrane. Will have an effect on the measurement of lead in the actual sample. Adding a layer of isolating material between the thin sample and the protective lead plate can effectively avoid the interference of the lead spectrum line in the protective lead plate on the sample measurement. (3) in model 316 stainless steel, brass, aluminum, The selection of copper and polytetrafluoroethylene (PTFE) as lead lining materials was studied. The results showed that the X-ray fluorescence spectra of copper contained the least number of elements, and there were no peaks of heavy metal Cr-CdCd-Pb in the spectra. The scattering spectral intensity of some targets with higher energy is weak, so the measurement of heavy metal elements Cr-CD and Pb in real samples will not be interfered with. As the inner lining metal material of lead plate, it can avoid the interference of lead spectral line in lead plate. Is the best thin-film X-ray fluorescence spectrum analysis of lead-lined metal materials. This study provides an important theoretical basis for assembling and building a portable X-ray fluorescence spectrometer for heavy metals in air and water.
【作者单位】：中国科学院安徽光学精密机械研究所环境光学与技术重点实验室;
【基金】：国家(863计划)项目(2013AA065502) 安徽省科技计划项目(1206c0805012) 安徽省杰出青年科学基金项目(1108085J19) 中国科学院仪器设备功能开发技术创新项目(yg2012071)资助
【分类号】：O657.34;TG142.71

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