Abstract
In this paper, we report for the first time the identification and assignments
of complex atomic emission spectra of mixed actinide oxides using laser-induced
plasma spectroscopy or laser-induced breakdown spectroscopy (LIBS). Preliminary
results of LIBS measurements on samples of uranium dioxide
(UO<sub>2</sub>)/plutonium dioxide (PuO<sub>2</sub>) and
UO<sub>2</sub>/PuO<sub>2</sub>/americium dioxide (AmO<sub>2</sub>)/neptunium
dioxide (NpO<sub>2</sub>) simulated fuel pellets (or mixed actinide oxide samples)
are reported and discussed. We have identified and assigned >800 atomic emission
lines for a UO<sub>2</sub>/PuO<sub>2</sub>/AmO<sub>2</sub>/NpO<sub>2</sub> fuel
pellet thus far. The identification and assignments of spectral emission lines for
U, Pu, and Am are consistent with wavelength data from the literature. However, only
a few emission lines have been assigned with a high degree of confidence for Np
compared with atomic emission data from the literature. We also indicate where
atomic emission lines for Cm would most likely appear in the spectral regions shown.
Finally, we demonstrate that a LIBS system with a resolving power of approximately
20 000 is adequate for analyzing complex mixtures of actinide elements within the
same sample.
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