[en] We have experimented with yttrium fluorescence in the various crystalline phases of ZrO₂. This work was a direct result of micro-Raman analysis of filter debris samples from Power Burst Facility. The yttrium fluorescence in the micro-Raman spectra provides a method for differentiating between fabricated zirconia and oxidized fuel-rod cladding. We can conclude from the spectra that some of the observed cubic ZrO₂ in the samples was not from fabricated zirconia and is probably oxidized fuel-rod cladding. This work also suggests a novel and unexplored line of research in fission-product chemistry and detection