Application of monolithic polycapillary focusing optics in MXRF

Ning Gao; Igor Yu. Ponomarev; Qi-Fan Xiao; Walter M. Gibson; D. A. Carpenter

doi:10.1117/12.245134

19 July 1996 Application of monolithic polycapillary focusing optics in MXRF

Ning Gao, Igor Yu. Ponomarev, Qi-Fan Xiao, Walter M. Gibson, D. A. Carpenter

Proceedings Volume 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications; (1996) https://doi.org/10.1117/12.245134
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A monolithic polycapillary focusing optic, consisting of hundreds of thousands of small tapered glass capillaries, can collect a large solid angle of x-rays from a point source and guide then through the capillaries by multiple total reflections to form an intense focused beam. Such a focused beam has many applications in microbeam x-ray fluorescence (MXRF) analysis. Two monolithic polycapillary focusing optics were tested and characterized in a MXRF set- up using a microfocusing x-ray source. For the CuK_(alpha ) line, the measured focal spot sizes of these optics were 105 micrometers and 43 micrometers full-width-half-maximum, respectively. When the source was operated at 16W, the average CuK_(alpha ) intensities over the focal spots were measured to be 2.5 X 10⁴ photons/s/micrometers² and 8.9 X 10⁴ photons/s/micrometers², respectively. When we compared the monolithic optics to straight monocapillary optics with approximately the same output beam sizes, intensity gains of 16 and 44 were obtained. The optics were applied to the MXRF set-up to analyze trace elements in various samples and a minimum detection limit of about 2 pg was achieved for the transition elements (V, Cr, Mn, and Fe). The optics were also used to map the distributions of trace elements in various samples.

Citation Download Citation

Ning Gao, Igor Yu. Ponomarev, Qi-Fan Xiao, Walter M. Gibson, and D. A. Carpenter "Application of monolithic polycapillary focusing optics in MXRF", Proc. SPIE 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications, (19 July 1996); https://doi.org/10.1117/12.245134

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