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| Design and Monochromaticity of a Monochromatic X-ray Calibration Device |
| GUO Si-ming,LI Meng-shi,HOU Dong-jie,WU Jin-jie,WANG Ji,WANG Bo,ZHAI Yu-dan,HUANG Jian-wei,ZHANG Jian |
| National Institute of Metrology, Beijing 100029, China |
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Abstract The monochromatic X-rays produced by crystal Bragg diffraction has the advantage of continuously adjustable energy, and is the preferred solution for X-ray detector calibration. In order to establish a 5~30keV single-energy X-ray radiation device, the Bragg diffraction study of crystal monochromator and grating monochromator is carried out. The position of the single-energy X-ray beam required to be emitted is adjusted when different Bragg angles are adjusted. To accurately perform detection efficiency calibration. The established single-energy X-ray calibration device is mainly composed of an X-ray machine, a diffractive crystal, and a synchronous rotating device, and covers an energy range 5~30keV. Combined with the single-energy X-ray source measurement results, the monochromaticity is calculated, and the energy broadening of the single-energy X-ray source is calculated according to the experimental conditions. The calculation results show that the single-energy X-ray source itself has very good monochromaticity, and its energy broadening is mainly caused by the size of the limiting beam, that is, the incident angle.
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2018, Vol. 39 
