Monte Carlo imaging simulation for X-ray spectrum estimation
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摘要: 针对高能强流电子束轰击高Z靶产生的X射线的能谱测量问题,采用蒙特卡罗方法进行成像模拟研究。高能X射线能谱通常由对X射线经过衰减体的直穿透射率曲线进行解谱获得。设计了带多准直孔的截锥体模型,在单次模拟成像中获得完整的衰减透射率曲线,有效避免了散射光子对透射率曲线以及X射线能谱重建的影响。成像面采用非均匀划分网格计数,将大部分探测计数点集中于各准直孔出口处,保证关注区域模拟成像的精细度,同时减少总体计算时间。Abstract: Imaging simulation by means of the Monte Carlo method is performed for the spectrum reconstruction of the X-ray which is produced by high-energy intense-current electron beam striking a high-Z target. Generally, the high-energy X-ray spectrum can be resolved from the primary transmission curve when the X-ray passes through the attenuator. A truncated cone model with collimating apertures is designed, by which an entire attenuation transmission curve is obtained in a single imaging simulation. The scattering photons are effectively obstructed from disturbing the transmission curve and finally the spectrum reconstruction. A non-uniform grid for tallying is adopted for the imaging plane in order to concentrate most of the probing tallies at the exit of each collimating aperture, which guarantees a fine imaging for the concerned region while reduces the total computing time.
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Key words:
- X-ray spectrum /
- Monte Carlo method /
- imaging simulation /
- spectral reconstruction
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