Krämer M, Kraft G
Gesellschaft für Schwerionenforschung, Biophysik, Darmstadt, Germany.
Radiat Environ Biophys. 1994;33(2):91-109. doi: 10.1007/BF01219334.
A Monte Carlo model is presented to study details of the energy deposition inside tracks of heavy charged particles in water vapor. The input data for most of the calculations based on the binary encounter approximation are double-differential cross sections for electron emission after heavy-ion impact. The paths of the liberated electrons are simulated, taking into account elastic scattering, ionization, and excitation. Each basic interaction of an electron or heavy ion is treated individually. Radial dose distributions and specific energy deposition are calculated for projectiles from protons to uranium in the energy range from one to several hundred mega-electron volts per unified atomic mass unit. Good agreement with measurements in tissue-equivalent gas and propane is obtained for light and medium-heavy projectiles, whereas for heavy projectiles such as uranium, deviations around a factor of 2-3 are observed.
提出了一个蒙特卡罗模型来研究重带电粒子在水蒸气中的径迹内能量沉积的细节。基于二元碰撞近似的大多数计算的输入数据是重离子碰撞后电子发射的双微分截面。考虑到弹性散射、电离和激发，对释放电子的路径进行了模拟。电子或重离子的每一次基本相互作用都单独处理。计算了能量范围从每统一原子质量单位1到几百兆电子伏特的质子到铀的射弹的径向剂量分布和比能量沉积。对于轻和中重射弹，与组织等效气体和丙烷中的测量结果取得了良好的一致性，而对于铀等重射弹，观察到约2至3倍的偏差。
