Optimizing the Elemental Sensitivity and Focal Spot Size of a Monolithic Polycapillary Optic Using Micro-X-Ray Fluorescence

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A commercial micro-X-ray fluorescence (MXRF) instrument with an aperture X-ray guide was used to compare elemental sensitivities and focal spot sizes with those obtained by focusing the source with a monolithic polycapillary optic retrofitted into the system. The capillary provided an intensity gain of 125 at 4 keV vs. using a pinhole beam collimator; however, this gain advantage declined with increasing analyte line energy as a result of the capillary being designed shorter than its optimal length to fit into the commercial instrument. A minimum capillary focal spot FWHM of 36 {micro}m was achieved, whereas the smallest pinhole aperture available ... continued below

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Worley, C.; Havrilla, G.; Gao, N. & Xia, Q.-F. October 1, 1998.

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A commercial micro-X-ray fluorescence (MXRF) instrument with an aperture X-ray guide was used to compare elemental sensitivities and focal spot sizes with those obtained by focusing the source with a monolithic polycapillary optic retrofitted into the system. The capillary provided an intensity gain of 125 at 4 keV vs. using a pinhole beam collimator; however, this gain advantage declined with increasing analyte line energy as a result of the capillary being designed shorter than its optimal length to fit into the commercial instrument. A minimum capillary focal spot FWHM of 36 {micro}m was achieved, whereas the smallest pinhole aperture available of 50 {micro}m in diameter produced a focal spot width of 69 {micro}m FWHM. Hence, better MXRF lateral resolution could be obtained with the capillary with a simultaneous improvement in elemental sensitivity.

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Medium: P; Size: vp.

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OSTI as DE00760043

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  • Denver X-Ray, Denver, CO (US), 10/1998

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  • Report No.: LA-UR-98-4168
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 760043
  • Archival Resource Key: ark:/67531/metadc723155

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  • October 1, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 2:50 p.m.

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Worley, C.; Havrilla, G.; Gao, N. & Xia, Q.-F. Optimizing the Elemental Sensitivity and Focal Spot Size of a Monolithic Polycapillary Optic Using Micro-X-Ray Fluorescence, article, October 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc723155/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.