An international journal published by K. N. Toosi University of Technology

Document Type : Research Article


Radiation Application Research School, Nuclear Science and Technology Research Institute, P.O. Box 31485-498, Karaj, Iran


In this work, the impact of magnetic field presence on the central axis depth-dose curves of helium ion beams inside a heterogeneous phantom with air and bone layers was investigated. According to the calculations, presence of the magnetic field has a considerable impact on the dose distribution of helium beams depending on the field strength and beam energy. A 32.3% abrupt increase and 92.5% reduction in dose were observed at the boundary between the water-air and the water-bone layer insert, respectively. The accuracy of the simulation was evaluated by verifying the depth dose curves of helium ion beams in a water phantom with experimental data.


  • The perturbations caused by the presence of a magnetic  eld in the dose pro le delivered to the patient is investigated.
  • Tissue heterogeneity can cause signi cant variation in the boundary of heterogeneous layers.
  • Dose changes depends on the location of heterogeneous layers, thickness and the energy of helium ions.


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