Figure 1.

Synchrotron microbeam X-ray fluorescence mapping of longitudinal hair sections from different body parts (scalp regions—left panel, and eyebrow, underarm, pubic, and leg hair—right panel) donated by the same person showing the elemental distribution of sodium, magnesium, silicon, aluminium, and oxygen. Elemental maps, all 80 µm × 80 µm in size, were produced with a 500 nm X-ray beam spot size to compromise between the signal and size of the features of interest. The detected elements increase from the blue color to the red color in the scale bar, with the colors indicating relative element content.