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Citation: Xu Zefang, Yan Yongqing, Qiang Pengfei, et al. Single energy X-ray source for calibration of X-ray detectors[J]. High Power Laser and Particle Beams, 2023, 35: 091007. doi: 10.11884/HPLPB202335.220422

Single energy X-ray source for calibration of X-ray detectors

doi: 10.11884/HPLPB202335.220422
  • Received Date: 2022-12-22
  • Accepted Date: 2023-06-17
  • Rev Recd Date: 2023-06-26
  • Available Online: 2023-06-30
  • Publish Date: 2023-09-15
  • To improve the calibration accuracy of X-ray detectors, this paper presents a method of placing filters in fluorescent X-ray emission channels to improve the purity of X-rays. Monte Carlo simulation model was established to analyze the relationship between the probability of photoelectric effect in K layer and the atomic number, and the curve of fluorescence intensity and purity with filter thickness was obtained. In atmospheric environment, the energy spectrum distribution and photon flux of fluorescent X-ray source were measured by silicon drift semiconductor detector, and the effect of X-ray tube voltage on photon flux and fluorescence purity was analyzed. When the radiator material is copper and the thickness of the filter (nickel) is 0 μm, 10 μm and 30 μm, the purity of fluorescence X-ray measured is 75.61%, 85.38% and 84.25%, and the photon flux is 3425 phs/s, 2023 phs/s and 1192 phs/s, respectively. The influence of filter thickness on the purity and intensity of fluorescent X-ray is confirmed, which provides a direction for solving the problem that it is difficult to calibrate X-ray detectors with high accuracy due to the lack of monochromatism of fluorescent X-ray light source.
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