Development and Study of Monoenergetic X-Ray Source Based on LiF200 Crystal Bragg Diffraction with Energy Spectrum Characteristics

Le résumé fourni par la source

As a core tool in precision detection technology, the monochromaticity and flux stability of monoenergetic X-rays directly impact experimental accuracy in applications such as detector calibration. There is an urgent need to overcome the limitations of conventional radioisotope sources (fixed energy) and Bragg diffraction systems (low diffraction efficiency). Leveraging the unique properties of LiF(200) crystal-specifically its high reflectivity and low thermal expansion coefficient-this study constructed a Bragg diffraction-based monoenergetic X-ray apparatus. By adjusting the Bragg angle via a θ-2θ goniometer and performing energy-dispersive spectroscopy (4-48.32 keV) using a Fast-SDD detector, the system's performance was characterized. Geant4 simulations were employed to model the detector geometry, while standard K-series characteristic X-ray sources calibrated the energy linearity and energy resolution. Comprehensive analysis evaluated the apparatus' energy response, energy resolution, and monochromaticity. Results demonstrate that the system achieves: Monochromaticity < 2.2% within 4-48.32 keV, count rate of 3166 cps at 10 keV. This provides a viable bench-top alternative for optimizing high-precision X-ray analytical instrumentation and supporting synchrotron radiation experiments.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.