Abstract
A dedicated end station has been developed to allow convenient spatially-resolved trace element analysis in air using proton-induced X-ray emission. The system is able to scan over three-dimensional surfaces while maintaining a constant air gap through the use of an optical surface profiler. The scanning stage provides movement of several inches for all three axes, allowing the system to have a dedicated load position which is stepped away from the proton collimator. Specimens can be viewed directly at the computer display while in the specimen load position. This allows scan areas, lines and points to be specified directly on the video image prior to acquisition. The PC-based acquisition system is capable of acquiring an entire 1024-point spectrum at each of up to 10000 spatial points. Elemental maps can be generated quickly, since all data is stored in RAM.
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