Small spot and high energy resolution XRF system for valence...

X-ray or gamma ray systems or devices – Specific application – Fluorescence

Reexamination Certificate

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Reexamination Certificate

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07899154

ABSTRACT:
An x-ray fluorescence technique for determining a valence state of a sample. An x-ray excitation path is provided for exciting a sample with x-rays; and an x-ray detection path is provided for detecting fluorescence emitted from the sample, and focusing the emitted fluorescence to a focal spot. The detection path may include a monochromating detection optic for focusing the fluorescence; and also may include a detector on which the focal spot is focused. The precise positions of the focal spot are sensed, from which valence states of the sample can be determined; and/or the detection optic can be rocked across certain angles of incidence, to change the Bragg conditions, thereby sensing different valence states within the sample.

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Birks L. et al: “X-ray fluorescence analysis of the concentration and valence state of sulfur in pollution samples” Spectrochimica Acta Part B, vol. 33, No. 7, 1978, pp. 305-310, XP002486663.
International Search Report for PCT/US2008/056944, dated Jul. 2, 2008.

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