Detection of Uranium Using Laser-Induced Breakdown Spectroscopy
Detection of Uranium Using Laser-Induced Breakdown Spectroscopy
复制标题
DOI：
10.1366/000370209789806867
复制
发表时间：
2009-11-01
影响因子：
3.5
通讯作者：
Navarro-Northrup, Claudia
中科院分区：
文献类型：
--
作者：
Chinni, Rosemarie C.;Cremers, David A.;Navarro-Northrup, Claudia
这项工作的目标是详细研究利用激光诱导击穿光谱法探测铀，以应用于与环境监测和探测大规模毁灭性武器有关的活动。这项研究被用来协助LIBS仪器的发展，用于远距离探测散装放射性和核材料，以及这些材料作为污染物分布在表面上。铀谱分析在各种不同的条件下，在室内压力，减压，并在氩气气氛中。由于铀谱线的高密度，所有谱线都显示出高的视背景。对选定铀谱线的时间衰变曲线进行了监测，并与其他元素进行了比较，试图最大限度地提高对复杂铀谱中每种物质的探测能力。进行了LIBS铀谱的调查，并确定了在260至800 nm范围内的相对发射线强度。这些光谱为在不同光谱区选择最强的铀探测LIBS分析线提供了指导。土壤中铀的检出限在近距离为0.26%w/w，在30英寸的距离为0.5%w/w。表面检测限取决于底物，范围为13至150 μ g/cm（2）。双脉冲实验（共线和正交安排），以提高铀信号在某些情况下。根据这项工作的结果，一个简短的评论是LIBS的适用性，用于检测表面上的铀残留物的环境监测和大规模杀伤性武器监视。
The goal of this work is a detailed study of uranium detection by laser-induced breakdown spectroscopy (LIBS) for application to activities associated with environmental surveillance and detecting weapons of mass destruction (WMD). The study was used to assist development of LIBS instruments for standoff detection of bulk radiological and nuclear materials and these materials distributed as contaminants on surfaces. Uranium spectra were analyzed under a variety of different conditions at room pressure, reduced pressures, and in an argon atmosphere. All spectra displayed a high apparent background due to the high density of uranium lines. Time decay curves of selected uranium lines were monitored and compared to other elements in an attempt to maximize detection capabilities for each species in the complicated uranium spectrum. A survey of the LIBS uranium spectra was conducted and relative emission line strengths were determined over the range of 260 to 800 nm. These spectra provide a guide for selection of the strongest LIBS analytical lines for uranium detection in different spectral regions. A detection limit for uranium in soil of 0.26% w/w was obtained at close range and 0.5% w/w was achieved at a distance of 30 in. Surface detection limits were substrate dependent and ranged from 13 to 150 mu g/cm(2). Double-pulse experiments (both collinear and orthogonal arrangements) were shown to enhance the uranium signal in some cases. Based on the results of this work, a short critique is given of the applicability of LIBS for the detection of uranium residues on surfaces for environmental monitoring and WMD surveillance.