Moravek, Zdenek and Bogner, Ludwig (2009) Analysis of the physical interactions of therapeutic proton beams in water with the use of Geant4 Monte Carlo calculations. ZEITSCHRIFT FUR MEDIZINISCHE PHYSIK, 19 (3). pp. 174-181. ISSN 0939-3889,
Full text not available from this repository. (Request a copy)Abstract
The processes that occur it,hen protons traverse a medium are investigated theoretically for a full therapeutic range of energies [20 Me V, 220 Me V]. The investigation is undertaken using the Geant4 toolkit for water medium. The beam is simulated only inside the phantom, effects of beamline are included in the overall beam properties as lateral width and momentum bandwidth. Every energy, deposition is, catalogued according to the particle and the process that caused if. The catalogued depositions are analysed statistically. There are only few important processes such as proton ionisation and nuclear scattering (elastic/inelastic) that constitute the main features of the energy, distribution. At the same time processes concerning electrons are used very often without obvious effect to the result. Such processes can be therefore approximated in the simulation codes in order to improve the performance of the code. Neutron depositions are most important before the Bragg peak, still they are by an order of magnitude smaller than those of protons. In the region behind the Bragg peak only; a small number of neutrons is created in the simulation and their energy; contribution through secondary; protons is by orders smaller than the effect of proton-produced secondary protons within the Bragg peak. Hence, the effects of neutrons created in the calculation volume can be neglected.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NUCLEAR-INTERACTIONS; SECONDARY NEUTRON; DISTRIBUTIONS; MODELS; Geant4; nuclear interactions; neutron dose; secondary particles |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Strahlentherapie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Oct 2020 07:09 |
| Last Modified: | 14 Oct 2020 07:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/29908 |
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