Heidelberg 2022 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 1: Radiation therapy I
ST 1.3: Vortrag
Montag, 21. März 2022, 14:30–14:45, ST-H4
Study of prompt gamma emission in c12(p, p*γ)c12 nuclear reactions close to a bragg peak — •Mariam Abuladze1,2, Ronja Hetzel3, Jonas Kasper3, Revaz Shanidze1,2, and Achim Stahl3 — 1Tbilisi State Univerity, Tbilisi, Georgia — 2Kutaisi International University, Kutaisi, Georgia — 3RWTH Aachen University, Aachen, Germany
Proton therapy is a high-quality radiation therapy which uses a proton beam to irradiate human tissue. The advantage of this type of treatment is a highly conformal dose deposition due to the presence of the Bragg peak. Though it is often required to irradiate the tumor volume with a precision better than 1 - 2 mm, which means that proton therapy needs not only precise treatment planning but also monitoring and proton range verification during the treatment. One of the ways to monitor the proton range is Prompt Gamma Imaging (PGI) which means to detect gamma rays produced by the excitation of the target nuclei by incident protons.
In this work, a results of the Geant4 simulation (version 10.6.3.) of interactions of 17.56 MeV protons with a carbon target are shown. This includes the study of 4.4 MeV and 9.6 MeV line properties, as multiple differences were observed between simulation and experiment, one of which is a double peak for the C12(p, p*γ)C12 spectral line. The shortcomings of the current physical models in Geant4 in describing the shape and intensity of the 4.4 MeV and 9.6 MeV gamma lines will be discussed.