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首页> 外文期刊>Biophysics >The Consideration of Biological Effectiveness of Low Energy Protons Using Biophysical Modeling of the Effects Induced by Exposure of V79 Cells
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The Consideration of Biological Effectiveness of Low Energy Protons Using Biophysical Modeling of the Effects Induced by Exposure of V79 Cells

机译:利用生物物理模型对低能质子的生物有效性进行考虑:V79细胞暴露引起的效应

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摘要

We have applied Monte Carlo track structure simulations to estimate relative biological effective-ness (RBE) of low-energy protons using biophysical modelling of radiation effects induced by exposure of V79 cells growing in mono-layer. The microscopic energy deposition in cell nucleus and sub-nucleus volumes was investigated in order to understand the reasons of enhanced biological effectiveness near Bragg peak. Theoretical estimations of RBE based on frequency/dose average lineal energy and calculated yields of initial DNA breaks were collated with experimental RBEM data. It was found: (1) dose average lineal energy for whole cell nucleus as a function of proton energy shows a distinct peak at 550 keV; (2) the peak values for sub-nucleus volumes are large compared with the whole cell nucleus; (3) the yield of complex DNA breaks cor-relates with experimental RBE_M data.
机译:我们已经应用蒙特卡洛轨道结构模拟来评估低能质子的相对生物有效性(RBE),方法是使用生物物理模型对由单层生长的V79细胞暴露引起的辐射效应进行辐射。为了了解在布拉格峰附近生物有效性增强的原因,研究了在细胞核和亚核体积中的微观能量沉积。基于频率/剂量平均线性能量和计算的初始DNA断裂的收率的RBE理论估计与实验RBEM数据进行了比较。发现:(1)全细胞核的剂量平均线性能量随质子能量的变化在550 keV处显示出明显的峰值; (2)与整个细胞核相比,亚核体积的峰值大; (3)复杂DNA断裂的产量与实验RBE_M数据相关。

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