Depth elemental imaging of forensic samples by confocal micro-XRF method.

摘要: Micro-XRF is a significant tool for the analysis of small regions. A micro-X-ray beam can be created in laboratory by various focusing X-ray optics. Previously, nondestructive 3D-XRF had not been easy because high penetration fluorescent X-rays emitted into sample. recently developed confocal micro-XRF technique combined with polycapillary lenses enables depth-selective analysis. In this paper, we applied new tabletop system to analyze several forensic samples, that is, multilayered automotive paint fragments and leather use criminaliztics. Elemental depth profiles mapping images samples were successfully obtained technique. Multilayered structures distinguished their elemental profiles. However, it was found some sheets exhibited heterogeneous distribution. To confirm validity, result conventional cross section compared micro-XRF. The results approximate agreement those imaging performed on homogeneity respective layers fragment showed homogeneous distribution each layer expect Fe Zn. contrast, components predominantly localized.