The low-energy ion range in DNA
The low-energy ion range in DNA
复制标题
DNA 中的低能离子范围
DOI：
10.1088/0031-9155/54/16/011
复制
发表时间：
2009
影响因子：
3.5
通讯作者：
I. Brown
中科院分区：
文献类型：
--
作者：
L. D. Yu;T. Kamwanna;I. Brown
在低能离子辐照DNA效应的基础研究中，经常需要计算一个重要的基本物理参数--低能离子射程。然而，到目前为止，还缺乏一个统一的射程计算模型和方法，报道的数据存在很大的分歧，因此不可靠。在这里，我们描述了一种计算离子射程的方法，使用一个简化的DNA靶的平均-伪原子模型。根据离子停止理论，对于低能(⩽，几keV)离子注入DNA时，停止处于低约化能区，这给出了停止的立方根能量依赖关系(E_1/3)。得到了DNA离子射程的计算公式，并给出了计算公式，以统一相关计算。对于低能情况，提出了离子能量上限作为轰击离子物种原子序数的函数。这种方法的结果与一些广泛使用的计算机模拟程序的结果以及与其他小组报告的结果的比较表明，本文所述的方法提供了令人信服和可靠的结果。
In fundamental studies of low-energy ion irradiation effects on DNA, calculation of the low-energy ion range, an important basic physical parameter, is often necessary. However, up to now a unified model and approach for range calculation is still lacking, and reported data are quite divergent and thus unreliable. Here we describe an approach for calculation of the ion range, using a simplified mean-pseudoatom model of the DNA target. Based on ion stopping theory, for the case of low-energy (⩽ a few keV) ion implantation into DNA, the stopping falls in the low reduced energy regime, which gives a cube-root energy dependence of the stopping (E1/3). Calculation formulas of the ion range in DNA are obtained and presented to unify the relevant calculations. The upper limits of the ion energy as a function of the atomic number of the bombarding ion species are proposed for the low-energy case to hold. Comparison of the results of this approach with the results of some widely used computer simulation codes and with results reported by other groups indicates that the approach described here provides convincing and dependable results.