Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (2): 45 doi: 10.1007/s41365-016-0041-6

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

A novel X-ray tube spectra reconstruction method based on transmission measurements

Jing Cao , Chun-Yu Jiang, Yan-Feng Zhao, Qing-Wei Yang, Ze-Jie Yin   

  1. 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
    2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
    3 Southwestern Institute of Physics, Chengdu 610041, China
  • Contact: Jing Cao E-mail:jcao@mail.ustc.edu.cn
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Jing Cao, Chun-Yu Jiang, Yan-Feng Zhao, Qing-Wei Yang, Ze-Jie Yin. A novel X-ray tube spectra reconstruction method based on transmission measurements.Nuclear Science and Techniques, 2016, 27(2): 45     doi: 10.1007/s41365-016-0041-6

Abstract:

A novel X-ray tube spectrum reconstruction method has been proposed based on transmission measurements. Aluminum bars of varying lengths attenuate the X-rays to different levels. The detectors are of lutetium yttrium oxyorthosilicate scintillator and silicon photomultiplier. With the detected X-ray intensities, the X-ray spectrum is unfolded using the least square method. The detectors, aluminum bars, and collimating apertures are integrated in a detection module made of lead. Its response to X-ray is calculated by Monte Carlo codes Geant4. Due to the high photon flux, the detectors work in current mode. The electronics system, consisting of 24-bit high-precision ADCs with 144KSPS sampling rate and field programmable gate array, makes the data acquisition process effective and precise. Measurements on a 70-kVp tungsten anode X-ray were taken to verify the method. The unfolded spectrum agrees well with the simulated spectrum, demonstrating that the method is reliable and practical.

Key words: X-ray tube, Spectrum unfolding, Transmission measurements, Geant4, LYSO, SiPM