A nondestructive elemental imaging is important for environmental, forensic, and material sciences. In this seminar, a few approaches for x-ray elemental imaging in the laboratory at OCU will be introduced.
1) Combination of glow discharge surface treatment and SEM-EDS
Glow discharge sputtering was used for fast surface cleaning of the steel sample. The details such as grain boundaries, surface defects, and inclusions on the surface were clearly observed by FE-SEM. 2D-elemental analysis was performed by SEM-EDS.
2) Scanning type micro-XRF method including confocal 3D-XRF
A confocal micro XRF instrument was developed using two polycapillary focusing lenses in the laboratory. This instrument showed a spatial (depth) resolution of 14 micro-meters for Au Lb. Several applications of confocal micro-XRF to forensic samples, industrial samples, and painting samples, will be shown.
3) Projection type XRF imaging (WD-XRF imaging)
The drawback of the confocal micro-XRF will be a long acquisition time. Thus, a projection type XRF imaging has been studied. In my laboratory, we have studied the combination of WD-XRF, straight polycapillary optics, and x-ray CCD camera. The preliminary elemental images will be shown.