Figure 6
(a) Gradual change of Np M5-edge HR-XANES spectra of a sample with 83 ± 2 p.p.m. Np sorbed on illite (cf. Section 6 for sample details) at 300.0 ± 1.5 K. Changes in the shoulder denoted as feature B are visible with irradiation time. (b) At cryogenic conditions (141.2 ± 1.5 K), no significant changes of the spectra are discernible within the noise level. |