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首页> 外文期刊>Physics in medicine and biology. >Evaluation of the mean energy deposit during the impact of charged particles on liquid water
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Evaluation of the mean energy deposit during the impact of charged particles on liquid water

机译：评估带电粒子撞击液态水期间的平均能量沉积

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The DNA strand break yield due to the impact of ionizing particles on living beings is closely related to the number of inelastic events per unit absorbed dose produced by these particles. The higher this number, the higher the probability of causing DNA strand breaks per unit absorbed dose. In a previous work, it was found that the total number of events produced by primary particles and the secondary electrons is almost independent of the type and energy of the incident particle (or LET). This finding could be supported by a quasiconstant mean energy deposit by inelastic event (ε?). In this work, ε? was defined and determined for electrons and the non-negative charge states of hydrogen (H 0.+) and helium (He 0.+.2+) species impacting on liquid water. Ionization, excitation and charge transfer (up to two-electron transfers) processes have been included in present calculations. We found that, for liquid water is within 13.7 ± 4.1 eV, 14.2 ± 1.7 eV and 13.8 ± 1.4 eV for electrons, hydrogen and helium species, respectively, with impact energies changing over three orders of magnitude. Unlike the mean excitation energy, the mean energy deposit per inelastic event depends not only on the target molecule but also on the projectile features. However, this dependence is relatively weak. This fact supports the quasi-independent number of inelastic events per unit absorbed dose found previously when charged particles impact on matter.
机译：由于电离粒子对生物的影响而导致的DNA链断裂产量与这些粒子每单位吸收剂量产生的无弹性事件的数量密切相关。该数字越高，每单位吸收剂量引起DNA链断裂的可能性就越高。在先前的工作中，发现一次粒子和二次电子产生的事件总数几乎与入射粒子（或LET）的类型和能量无关。非弹性事件的准恒定平均能量沉积（ε？）可以支持这一发现。在这项工作中，ε？定义并确定了电子和影响液态水的氢（H 0. +）和氦（He 0。+。2+）物种的非负电荷态。电离，激发和电荷转移（最多两电子转移）过程已包括在当前计算中。我们发现，对于液态水，电子，氢和氦物种的水分别在13.7±4.1 eV，14.2±1.7 eV和13.8±1.4 eV范围内，其冲击能变化了三个数量级。与平均激发能量不同，每个非弹性事件的平均能量沉积不仅取决于目标分子，而且取决于弹丸特征。但是，这种依赖性相对较弱。这一事实支持了带电粒子撞击物质时先前发现的每单位吸收剂量的非弹性事件的准无关数量。

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