论文信息 - Wavelength‐dispersive x‐ray fluorescence detector

Wavelength‐dispersive x‐ray fluorescence detector

A wavelength‐dispersive x‐ray fluorescence detector system has been developed that can be used to discriminate fluorescent photon energies for practically any incident flux. The system uses a Kumakhov polycapillary lens to collimate fluorescent photons from a sample. The collimated photons are transmitted to a crystal‐counter combination on a stepping motor driven θ–2θ stage. The stage diffracts the photon wavelength of interest and a photon‐counting or current‐mode counter is used to measure the photons. The system had a resolution of less than 150 eV at 8 keV using the (200) reflection from an abraded and etched LiF crystal, and was easily able to discriminate between Zn Kα (8.620 keV) and Cu Kβ (8.905 keV) x rays emitted from a brass sample. The LiF (400) reflection had a resolution of approximately 50 eV, but with ten times less intensity.

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