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 ›› 2003, Vol. 14 ›› Issue (2): 138


Reconstruction of 12 MV bremsstrahlung spectra from measured transmission data

LEI Jia-Rong1, RAN Shu-Yang2, YUAN Yong-Gang1, FU Yu-Chuan2   

  1. 1Institute of Southwest Nuclear Physics and Chemistry, Mianyang 621900;
    2Key Laboratory for Radiation Physics and Technology of Education Ministry of China, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064
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LEI Jia-Rong, RAN Shu-Yang, YUAN Yong-Gang, FU Yu-Chuan. Reconstruction of 12 MV bremsstrahlung spectra from measured transmission data.Nuclear Science and Techniques, 2003, 14(2): 138

Abstract: Transmission data for 12 MV bremsstrahlung beams produced by the process for continuous-pulsed 12 MV electrons coming from a linear accelerator hitting a 1.2 mm thick plane tantalum target have been acquired with a combination of iron and Telfon attenuators. Two solid state dosimeters with LiF-TLD material surrounded Telfon were used as detectors. It has been checked that the experimental system achieves reasonably narrow-beam geometry by Monte Carlo simulations. From these transmission data, the original energy photon spectrum has been reconstructed using the iterative least-squares technique and compared with the spectrum calculated with Monte Carlo code system EGSnrc. The comparison shows that the numerical technique for analysis of transmission data can represent 12 MV bremsstrahlung spectrum acceptably well. The purpose of our work is to provide an effective way to reconstruct an unknown photon spectrum with high energy component and prove the correctness of this way. 

Key words: Electron bremsstrahlung spectra, Attenuation analysis, Least-squares method, Monte Carlo