Effect of transverse magnetic field on dose distributions of yttrium 90 skin patch source

The total dose absorbed on the tumor cell from skin patch sources used in clinical superficial brachytherapy should be limited within target volume order to minimize potential side effects. Average range of beta particles tissue may exceed thickness a beyond volume, causing effects by damaging deeper located healthy and bone underneath tumor. It is desired possible selecting short-range radionuclide. Administering treatment under an external magnetic field another option for reducing To achieve this, this study, percentage deep (PDD) transverse profile (TDP) distributions source labeled with Yttrium 90 (90Y) using GEANT4-based GAMOS Monte Carlo code were examined before after applying field, it was evaluated whether limit certain or not.
 Simulation results showed that, along application values increased 7.2% 3.1% respectively at 0.25 mm 1.0 depths whereas decreased 9.4%, 25.0%, 41.8% 57.6%, 2.0 mm, 3.0 4.0 5.0 central axis surface phantom respect 0 T field. In case surface, amount accumulated value 89% dose, while 98% intensity 1.5 T, received 10.1%.