研究目的
Investigating the performance of an assembled X-ray optics system for micro X-ray fluorescence spectrometry.
研究成果
The assembled X-ray optics produced a micro X-ray beam with a focal spot of 9.3 μm and a small divergence angle of 4.3 mrad. It effectively increased the photon flux of the focal spot compared with TMXRL single used. The micro beam with small focal spot and high relative gain will be useful for μ-XRF analysis.
研究不足
The divergence angle of the PSFXRL was much larger than the receiving angle of the TMXRL, resulting in few X-rays from the PSFXRL being received by the TMXRL. The transmission efficiency of the assembled X-ray optics was low.
1：Experimental Design and Method Selection:
The study constructed a μ-XRF spectrometry instrument based on an assembled X-ray optics consisting of a polycapillary slightly focusing X-ray lens and a tapered monocapillary X-ray lens (TMXRL). The performance was evaluated by comparing different capillary X-ray optics.
2：Sample Selection and Data Sources:
An iron plate was used to measure the intensity of Fe Kα to indicate the analysis efficiency. A stainless steel mesh was used for two-dimensional mapping.
3：List of Experimental Equipment and Materials:
Mo rotating anode X-ray generator, silicon drift detector, motorized X-Y-Z stage, polycapillary slightly focusing X-ray lens, tapered monocapillary X-ray lens.
4：Experimental Procedures and Operational Workflow:
The distance between the PSFXRL end and the TMXRL end was optimized. The diameter of the output beam of the TMXRL was measured by the knife edge scanning method.
5：Data Analysis Methods:
The relative gain was defined as a ratio of the intensity per unit of the focal spot of the capillary X-ray optics to the intensity per unit of the pinhole. The contrast of the mapping images was calculated to evaluate the image sharpness.
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