高能铁离子在水介质中核反应过程所导致的能量沉积

在银河宇宙射线中，400MeV/nucleon的铁离子通量相对来讲是较高的，400MeV/nucleon的铁离子对空间辐射引起的损伤和辐射剂量有重要的贡献.本文以Geant4为基础，对400MeV/nucleon Fe离子与物质相互作用后通过核反应过程产生的次级碎片进行模拟分析.对铁离子在水中产生的能量沉积和铁离子与水介质发生核反应后产生的次级碎片的能量沉积进行了模拟研究，得到了通过核反应过程产生次级粒子所导致的剂量贡献. 关键词： 能量沉积 剂量 碎片

Nuclear reaction stopping of 400MeV/nucleon 56Fe in water

Geant4 toolkit for Monte Carlo simulation is used in high energy heavy ion energy deposition simulation. The energy deposit of relativistic 400MeV/nucleon ⁵⁶Fe has contributions from three sources, namely electronic stopping, nuclear stopping and nuclear reaction stopping. The electronic stopping and nuclear stopping are well known ionization, excitation and elastic collision of particles, the nuclear reaction stopping comes from the contribution of secondary particles emitted from nuclei during nuclear reaction. Yields of secondary particlesinduced by relativistic ⁵⁶Fe in water and the energy deposited near the track are calculated.