A Differential Flourescence Monitor for Elements of AdjacentAtomic Number but Grossly Different Concentrations

原子序数相邻但浓度差异很大的元素的差异荧光监测器

• 批准号: 8961443
• 负责人: Abdelfatah Yacout
• 金额: $ 5万
• 依托单位: Quantum Research Services, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1990-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8961443&HistoricalAwards=false
• 关键词: Differential; Flourescence; Monitor; Elements; AdjacentAtomic

A technique is proposed whereby energy-dispersive X-ray fluorescence analysis can be made to accurately measure small concentrations ( 1%) of an element in a sample whose composition is dominated (90%) by an element of similar but larger atomic number (Z). Such measurement is now precluded by the overwhelming fluorescence signal from the dominant element. The proposed technique would employ a primary photon source, a secondary fluorescer, one or more filters, and differential analysis of the observed spectra. The key features of the technique are (1) reduction of the fluorescence from the interfering element by appropriately shifting the incident energy below the excitation of the dominant (K ) X rays and (2) incorporation of secondary effects by use of a differencing scheme. As an initial demonstration of the technique, we will attempt to show that it is possible to detect manganese (Z=25) at the 1% level in carbon steel having 98% iron (Z=26). Experimental verification of the technique will be undertaken.

提出了一种能量色散X射线荧光 可以进行分析，以准确测量小浓度（1%） 指样品中的一种元素，其成分占主导地位（90%）， 原子序数相似但较大的元素（Z）。 这种测量 现在排除了压倒性的荧光信号从 主导元素 所提出的技术将采用一个主要的 光子源、次级荧光剂、一个或多个滤光器，以及 对观察到的光谱进行差分分析。 的主要特点 该技术是（1）减少来自 通过适当地移动入射能量， 低于主（K）X射线的激发和（2）掺入 二次效应的差分格式。 作为初始 为了展示这项技术，我们将试图证明它是 可检测碳钢中1%水平的锰（Z=25） 含98%铁（Z=26）。 技术的实验验证 将进行。