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Monte Carlo simulation for bremsstrahlung and photoneutron yields in high-energy x-ray radiography 下载免费PDF全文
This paper reports on the results of calculations using
a Monte Carlo code (MCNP5) to study the properties of photons,
electrons and photoneutrons obtained in the converted target and
their transportations in x-ray radiography. A comparison between
measurements and calculations for bremsstrahlung and
photoneutrons is presented. The radiographic rule and the effect of
the collimator on the image are studied with the experimental model.
The results provide exact parameters for the optimal design of
radiographic layout and shielding systems. 相似文献
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磷光增感屏的内禀性质对磷光增感屏的成像性能影响很大.基于米氏(Mie)散射理论,计算得到磷光增感屏在不同颗粒尺寸和不同颗粒堆积密度情况下的散射系数和吸收系数.然后利用Monte Carlo(MC)方法模拟了可见光光子在磷光增感屏Gd2O2S:Tb(GOS)内的散射和吸收事件,得到磷光增感屏内不同位置处的可见光收集效率.利用MCNP程序模拟X射线束在磷光增感屏内的能量沉积分布,得到了金属-磷光增感屏总的点扩展函数(PSF).结果表明,在兆伏X射线成像系统中,使用小颗粒尺寸和高堆积密度的GOS磷光屏,可以改善增感屏系统的空间分辨率. 相似文献
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