title: Proton-induced x-ray emission analysis of single human hair roots.
abstract: Collimated beams of 3.75 million electron volt protons were used to examine a 2-millimeter length of the root end of human hair; the concentrations of some hair root elements were correlated with the results of standard clinical assays of blood samples. The technique should be useful for the analysis of micro amounts of biological tissue.
mesh_terms: D002118:Calcium / Q000032:analysis / Q000097:blood; D002675:Child, Preschool; D003300:Copper / Q000032:analysis / Q000097:blood; D004602:Elements; D005260:Female; D006197:Hair / Q000032:analysis*; D006801:Humans; D007501:Iron / Q000032:analysis; D008297:Male; D011522:Protons; D012737:Sex Factors; D014965:X-Rays
chemical_list: D004602:Elements; D011522:Protons; D003300:Copper; D007501:Iron; D002118:Calcium