portable X-ray fluorescence spectroscopy (Other Keyword)
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Discovering Hidden Layers with X-Ray Vision: New Applications of pXRF to Rock Art Studies (2015)
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Exploring new applications of portable X-ray fluorescence spectroscopy to the study of rock art, we report the determination of paint layer stratigraphy based upon measured elemental levels. In Lower Pecos rock art, we were able to discern when red and yellow paints superimpose black paints based on elevated levels of manganese. This ability to see underneath paint layers with "X-ray vision" shows great promise in answering stratigraphic ambiguities, complimenting Dino-Lite digital microscopy....