Micro X-Ray Fluorescence of Particles Using a Laboratory X-Ray Source and Capillary Optics
J R. Swider, Terrence J. Jach, Eric B. Steel
We are developing a micro X-ray fluorescence (micro-XRF) instrument that combines a polycapillary optic with a standalone X-ray tube. The optic transmits and focuses an X-ray beam down to 50 υm fwhm. The tight resolution is enhanced by a significant increase in flux, making particle detection and resolution possible on a laboratory scale. The first fluorescence studies examined spheres of Ti and two NIST Microanalysis glasses, K-411 and K-919. This system produced low background spectra, flexibility in instrument arrangement, and nonogram levels of detection. Future improvements will reduce detection limits and provide an ideal arrangement for a highly sensitive, portable micro-XRF instrument.