期刊
OPTIK
卷 282, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2023.170838
关键词
Monochromatic micro X-ray fluorescence; Polycapillary X-ray lens; X-ray fluorescence spectrometer
类别
This paper presents the development of a laboratory M mu-XRF spectrometer for X-ray tubes with high resolution and low detection limit. The spectrometer consists of polycapillary X-ray lenses and a flat crystal, which convert divergent broadband X-rays into quasi-parallel X-rays and obtain monochromatic X-rays through crystal diffraction. The monochromatic X-rays are then focused by a polycapillary half-focusing X-ray lens to provide spatial resolution for fluorescence analysis. The spectrometer is capable of detecting elements such as Se with a detection limit of 52 μg/L and light elements like Mn with a detection limit of 970 μg/L.
Monochromatic micro X-ray fluorescence (M mu-XRF) analysis has the advantages of high resolu-tion and low detection limit and is a powerful tool to obtain information on element distribution and concentration in materials. An M mu-XRF spectrometer for laboratory X-ray tubes is developed in this paper, which mainly composed of an X-ray tube, two polycapillary X-ray lenses and a flat crystal. The polycapillary parallel X-ray lens converts the divergent broadband X-rays emitted by the X-ray tube into quasi-parallel X-rays and projects them onto a flat crystal, where mono-chromatic X-rays are obtained by crystal diffraction. The monochromatic X-rays are then focused by a polycapillary half-focusing X-ray lens to provide spatial resolution for fluorescence analysis. The combination of the two makes it possible to perform M mu-XRF under laboratory low-power X-ray tube conditions (5.3 W molybdenum tube). By selecting polycapillary half-focusing X-ray lenses with different parameters, the spectrometer can provide a spatial resolution of tens to hundreds of microns to suit various application requirements. The detection limits of the M mu-XRF spectrometer are also measured using standard solutions. Experimental results show that the detection limit of Se is 52 mu g/L and that the detection limit for light elements such as Mn is 970 mu g/L.
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