Proton Bragg curves in water for 67.5 MeV protons
Authors:
Bruce Faddegon, Jungwook Shin and
Jose' Ramos-Méndez, University of California, San Francisco, US
Short description: A 67.5
MeV proton beam with a Gaussian energy spread of 0.4
MeV, and a uniform 5 mm x 10 mm oval spot travels
through a tantalum (Ta) foil of either 101.6 micrometer or 381 micrometer thickness. Then the beam interacts with a secondary emission monitor (SEM)
and a kapton exit window before reaching a mylar wall and water phantom of 280 mm x 280 mm x 50 mm with back
surface located downstream the Mylar wall.
Geant-val layout:
LowEProtonBraggBeak
Reference data: The depth-dose curves in water (ionization potential I=78 eV) are calculated and then fitted with an
analytical expression for the Bragg curve. The fitting parameters range R and spread sigma are compared against the corresponding experimental
parameters from depth-dose measurement from [1]
[1] Faddegon B, Shin J, Castenada C M, Ramos-Méndez J and Daftari I K Experimental depth dose curves of a 67.5
MeV proton beam for benchmarking and validation of Monte Carlo simulation Med. Phys. 42 4199–210 (2015)
Tested EM physics constructors:
- G4EmStandardPhysics_option3
- G4EmStandardPhysics_option4
- G4EmLivermorePhysics
- G4EmPenelopePhysics
Tested Hadronic physics:
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SusannaGuatelli - 2019-04-18