Preliminary comparison of monolithic and aperture optics for XRMF Page: 7 of 8
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Havrilla & Worley
Preliminary Comparison of Monolithic and Aperture Optics for XRMF
spectrum in Figure 5 is from a 50 L drop of a 10 ng/mL standard solution, which was allowed
to dry on a polypropylene substrate. The calculated limit of detection for the iron in the sample is
less than 0.1 ng/mL. Since there is less than 0.5 ng of iron in the dried spot, the estimated amount
of iron in the excitation region approaches less than 0.05 ng. The sensitivity calculated for
aperture excitation of the same sample using a 300 micron aperture is slightly greater than 1
ng/mL. Thus, the capillary exhibits better than an order of magnitude improvement in sensitivity.
Monolithic capillary optics are feasible for retrofit in Omicron instruments. The
enhancement in flux improves the analytical sensitivity of both qualitative and quantitative
analysis. The major drawback is the critical alignment necessary to achieve both flux throughput
and complete energy distribution. The need for fine motion control of x, y and z axes to optimize
the flux and energy distribution would make the retrofit implementation of the monolithic
capillary easier and maximize its effectiveness. The potential for even further gains in analytical
sensitivity when the capillary is coupled with a higher power x-ray tube will be explored in the
future. Further experiments in alignment within the constraints of the standard Omicron
geometry as well as exploring potential design changes will also be investigated.
The authors would like to acknowledge fruitful discussions and assistance from XOS
personnel, David Gibson, Phil Bly, Qi-Fan Xiao, and Ian Hart, and David Wherry of Kevex. Los
Alamos is operated by the University of California for the Department of Energy. Identification
of specific vendors is not an endorsement of particular instrumentation.
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Advances in X-ray Analysis
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Havrilla, G.J. & Worley, C.G. Preliminary comparison of monolithic and aperture optics for XRMF, article, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc685505/m1/7/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.