Minority additive distributions in a ceramic metal-halide arc lamp using high-energy x-ray induced fluorescence

Curry, J. J.; Adler, H. G.; Shastri, S. D.; Lawler, J. E.
September 2001
Applied Physics Letters;9/24/2001, Vol. 79 Issue 13
Academic Journal
X-ray induced fluorescence is used to measure the elemental densities of minority additives in a metal-halide arc contained inside a translucent ceramic envelope. A monochromatic x-ray beam from the Sector 1 Insertion Device beamline at the Advanced Photon Source is used to excite K-shell x-ray fluorescence in the constituents of a ceramic metal-halide arc lamp dosed with DyI[sub 3] and CsI. Fluorescence and scattered photons are collected by a cryogenic energy-resolving Ge detector. The high signal-to-noise spectra show strong fluorescence from Dy, Cs, and I, as well as elastic scattering from Hg. Radial distributions of the absolute elemental densities of Dy, Cs, and I are obtained. © 2001 American Institute of Physics.


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