Figure 2

Example of the detection of U particles using SEM–EDX. (a) Optical image and (b) back-scattered electron detection (BED) image of U particle (UP1) on Fe particles. (c) The BED image at high magnification indicated by the blue square in (b). (d) EDS spectrum of the area indicated by the red square in (a). (e) Elemental maps of the major content in the U particles.