Abstract
Development and calibration of a high-intensity, ‘‘two-color’’ x-ray source for application to differential absorption measurements of aluminum is described. The output intensity from this source is predominantly in two atomic emission lines: the aluminum and silicon Kα lines at 1.49 and 1.74 keV, respectively. Anode fabrication techniques and modifications to a commercial rotating anode x-ray generator necessary to achieve this unique source are detailed. Measurements made with an ionization chamber suggest that the output intensity of the aluminum Kα line is 1.1×109 photons/s mm2 at a distance of 60 mm from anode center when operated at 20 kV and 10 mA. The aluminum line intensity was about 50% of the silicon line. These same techniques can be readily adapted to produce a variety of selected atomic line spectra for differential absorption diagnostics of other species of interest.
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