Figure 2
From: The nature of Pu-bearing particles from the Maralinga nuclear testing site, Australia
Pu and U µXANES of the Potatohead, Bruce and CeresI hot particles. (a) Pu µXANES of particles, compared to Pu XANES standards (*) from Conradson et al.10,50; locations of the spectra are shown in the Pu L3 µSXRF maps, together with analysis numbers; (b) derivatives of the data shown in (a); (c) first principle FMDNES simulations of Pu spectra. PuO2 was calculated to check that the simulations can reproduce known spectra and then these simulations were used to calculate Pu-carbide spectra, demonstrating that these have a white line at lower energy than PuO2. Crystal structure data: PuC51; Pu2C352; PuO253; Pu2O354; δ-Pu55; α-Pu56. (d) U µXANES of particles compared to uraninite (predominantly U4+) and uranyl nitrate (U6+). Inset shows the first derivative of the µXANES spectrum. The spectra of metallic U and UC as taken from13.
