铀同位素飞秒激光烧蚀羽流的二维荧光光谱。

Two-dimensional fluorescence spectroscopy of uranium isotopes in femtosecond laser ablation plumes.

机构信息

Pacific Northwest National Laboratory, Richland, WA, 99352, USA.

Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.

出版信息

Sci Rep. 2017 Jun 19;7(1):3784. doi: 10.1038/s41598-017-03865-9.

DOI:10.1038/s41598-017-03865-9

PMID:28630409

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5476594/

Abstract

We demonstrate measurement of uranium isotopes in femtosecond laser ablation plumes using two-dimensional fluorescence spectroscopy (2DFS). The high-resolution, tunable CW-laser spectroscopy technique clearly distinguishes atomic absorption from U and U in natural and highly enriched uranium metal samples. We present analysis of spectral resolution and analytical performance of 2DFS as a function of ambient pressure. Simultaneous measurement using time-resolved absorption spectroscopy provides information on temporal dynamics of the laser ablation plume and saturation behavior of fluorescence signals. The rapid, non-contact measurement is promising for in-field, standoff measurements of uranium enrichment for nuclear safety and security.

摘要

我们展示了使用二维荧光光谱法（2DFS）测量飞秒激光烧蚀羽流中的铀同位素。这种高分辨率、可调谐的连续波激光光谱技术可以清晰地区分天然和高浓缩铀金属样品中原子吸收和 U 和 U。我们分析了 2DFS 的光谱分辨率和分析性能随环境压力的变化。使用时间分辨吸收光谱进行同时测量可以提供有关激光烧蚀羽流的时间动态和荧光信号的饱和行为的信息。这种快速、非接触式的测量方法有望用于核安全和保障领域的现场、远程铀浓缩度的测量。