Monte Carlo simulations for 20 MV X-ray spectrum reconstruction of a linear induction accelerator

WANG Yi; LI Qin; JIANG Xiao-Guo

doi:10.1088/1674-1137/36/9/012

Chinese Physics C> 2012, Vol. 36> Issue(9) : 861-866 DOI: 10.1088/1674-1137/36/9/012

Monte Carlo simulations for 20 MV X-ray spectrum reconstruction of a linear induction accelerator

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Abstract：
To study the spectrum reconstruction of the 20 MV X-ray generated by the Dragon-I linear induction accelerator, the Monte Carlo method is applied to simulate the attenuations of the X-ray in the attenuators of different thicknesses and thus provide the transmission data. As is known, the spectrum estimation from transmission data is an ill-conditioned problem. The method based on iterative perturbations is employed to derive the X-ray spectra, where initial guesses are used to start the process. This algorithm takes into account not only the minimization of the differences between the measured and the calculated transmissions but also the smoothness feature of the spectrum function. In this work, various filter materials are put to use as the attenuator, and the condition for an accurate and robust solution of the X-ray spectrum calculation is demonstrated. The influences of the scattering photons within different intervals of emergence angle on the X-ray spectrum reconstruction are also analyzed.

References

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WANG Yi, LI Qin and JIANG Xiao-Guo. Monte Carlo simulations for 20 MV X-ray spectrum reconstruction of a linear induction accelerator[J]. Chinese Physics C, 2012, 36(9): 861-866. doi: 10.1088/1674-1137/36/9/012

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Received: 2011-12-23
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo simulations for 20 MV X-ray spectrum reconstruction of a linear induction accelerator

Corresponding author: WANG Yi,

Received Date: 2011-12-23

Accepted Date: 1900-01-01

Available Online: 2012-09-05

Abstract: To study the spectrum reconstruction of the 20 MV X-ray generated by the Dragon-I linear induction accelerator, the Monte Carlo method is applied to simulate the attenuations of the X-ray in the attenuators of different thicknesses and thus provide the transmission data. As is known, the spectrum estimation from transmission data is an ill-conditioned problem. The method based on iterative perturbations is employed to derive the X-ray spectra, where initial guesses are used to start the process. This algorithm takes into account not only the minimization of the differences between the measured and the calculated transmissions but also the smoothness feature of the spectrum function. In this work, various filter materials are put to use as the attenuator, and the condition for an accurate and robust solution of the X-ray spectrum calculation is demonstrated. The influences of the scattering photons within different intervals of emergence angle on the X-ray spectrum reconstruction are also analyzed.

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Monte Carlo simulations for 20 MV X-ray spectrum reconstruction of a linear induction accelerator

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