title: Line-focusing x-ray monochromator for the analysis of trace elements in biological specimens.
abstract: A line-focusing x-ray monochromator has been designed and developed to be used with an energy dispersive detection system for the quantitative analysis of trace elements in biological specimens. This instrument uses a cylindrically curved Johansson-type crystal to monochromatize and focus the excitation radiation into a line 0.5 mm wide and 40 mm long. The excitation radiation chosen for these experiments was Mo Kalpha and the total intensity of the line-focused beam was estimated to be 2 X 10(7) cps. Because of the narrow width and high power density of the excitation between beam, small tissue specimens 1 X 1 X 12 mm in size along with a single strand of hair were analyzed for trace elements from Al through Sr. For the transition elements, concentrations of a few parts per million were easily detected with this analyzer.
mesh_terms: D006197:Hair / Q000032:analysis; D009206:Myocardium / Q000032:analysis; D013050:Spectrometry, Fluorescence / Q000295:instrumentation; D014131:Trace Elements / Q000032:analysis*; D014965:X-Rays
chemical_list: D014131:Trace Elements