title: Sample preparation and system calibration for proton-induced X-ray emission analysis of hair from occupationally exposed workers.
mesh_terms: D004781:Environmental Exposure; D006197:Hair / Q000032:analysis*; D006801:Humans; D013052:Spectrometry, X-Ray Emission; D014131:Trace Elements / Q000032:analysis*
chemical_list: D014131:Trace Elements