X射线在重金属-二氧化硅界面的剂量增强的模拟计算
Simulative calculation of the dose enhancement factor of W-SiO2 and Ta-SiO2 interface
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摘要: 当X射线射入不同材料组成的界面时, 在低Z材料的一侧将产生剂量增强。介绍了界面剂量增强效应的基本原理, 并用MCNP蒙特-卡洛程序计算了钨-二氧化硅、钽-二氧化硅界面的剂量增强因子。计算结果表明在X射线能量为100~150keV时,界面附近二氧化硅一侧存在较大的剂量增强。Abstract: The dose would be enhanced in low Z material when X-ray enters the interface which is constructed with different materials. The mechanic of dose enhancement is introduced in this article, and the Dose Enhancement Factors Of W-SiO2、Ta-SiO2 interface are calculated in the article. The calculated results demonstrate that there exits stronger dose-enhancement in the SiO2 side near the interface when the energy of X-ray is between 100keV and 150keV.
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Key words:
- x-ray /
- interface /
- radiation impairment /
- dose-enhancement-factor
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