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Title: Temperature effect on laser-induced breakdown spectroscopy spectra of molten and solid salts

Laser-induced breakdown spectroscopy (LIBS) has been investigated as a potential analytical tool to improve operations and safeguards for electrorefiners, such as those used in processing spent nuclear fuel. This study set out to better understand the effect of sample temperature and physical state on LIBS spectra of molten and solid salts by building calibration curves of cerium and assessing self-absorption, plasma temperature, electron density, and local thermal equilibrium (LTE). Samples were composed of a LiCl–KCl eutectic salt, an internal standard of MnCl2, and varying concentrations of CeCl3 (0.1, 0.3, 0.5, 0.8, and 1.0 wt.% Ce) under different temperatures (773, 723, 673, 623, and 573 K). Analysis of salts in their molten form is preferred as plasma plumes from molten samples experienced less self-absorption, less variability in plasma temperature, and higher clearance of the minimum electron density required for local thermal equilibrium. These differences are attributed to plasma dynamics as a result of phase changes. Spectral reproducibility was also better in the molten state due to sample homogeneity.
Authors:
; ;
Publication Date:
OSTI Identifier:
1148994
Report Number(s):
INL/JOU-13-29845
Journal ID: ISSN 0584-8547
DOE Contract Number:
DE-AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Spectrochimica Acta. Part B, Atomic Spectroscopy; Journal Volume: 97
Research Org:
Idaho National Laboratory (INL)
Sponsoring Org:
DOE - NA
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; ELECTRON DENSITY; ELECTROREFINING; ELECTRON TEMPERATURE; ION TEMPERATURE; SELF-ABSORPTION electron density; electrorefining; LIBS; local thermal equilibrium (LTE); plasma temperature; self-absorption