The present study is aimed at investigating the behavior of the secondary particles due to the photon beam interaction at the presence of the longitudinal, radial, tangential (angles), and uniformly springy magnetic fields with different intensities. The photon mode of a 15 MV Siemens Primus linac is used as an example. On the validity of the accelerator simulation, the percentage of depth dose and dose profile were also measured in the water phantom in 5-Azar hospital. The simulation has been performed by the Geant4.10.3 version in order to assess investigate the effect of different magnetic fields with a variety of intensity on dose profiles. Based on the profile dose distribution obtained for magnetic fields with different types and intensities it can be realized that the field of 3 T has the optimal condensation of the dose profile distribution. The striking feature the flux of electrons dramatically decreases for the tangential field compared to other magnetic fields, as in the dose profile graphs of this filed were shown.

本研究旨在研究在存在不同强度的纵向、径向、切向（角度）和均匀弹性磁场的情况下由于光子束相互作用而产生的次级粒子的行为。以 15 MV Siemens Primus 直线加速器的光子模式为例。关于加速器模拟的有效性，还在 5-Azar 医院的水体模型中测量了深度剂量百分比和剂量分布。模拟由 Geant4.10.3 版本执行，以评估不同强度的不同磁场对剂量分布的影响。基于对不同类型和强度的磁场获得的分布剂量分布，可以实现3 T的场具有剂量分布分布的最佳凝聚。与其他磁场相比，切向场的电子通量显着降低，如该场的剂量分布图所示。