Confocal XRF imaging of forensic samples

A Japanese group led by Professor K. Tsuji (Osaka City University, Japan) recently reported an interesting application of 3D micro X-ray fluorescence (XRF) imaging. One should note that their research employed low-power laboratory X-ray sources (30-50W, Mo tube) instead of synchrotron X-rays. They also used two polycapillary lenses for both incoming and outgoing directions to limit the viewing volume in 3D. The research group measured some forensic samples such as multilayered automotive paint fragments, leather samples etc., which have different color coatings. They analyzed 3D profiles of many elements (Si, S, Cl, K, Ca, Ti, Mn, Fe, Zn, and Ba) and discussed the relationship with the coating. For more information, see the paper, "Depth Elemental Imaging of Forensic Samples by Confocal micro-XRF Method", K. Nakano et al., Anal. Chem., Article ASAP (DOI: 10.1021/ac1033177 Publication Date (Web): March 25, 2011).