Congress:
EuroSafe Imaging 2021
Keywords:
Radioprotection / Radiation dose, Digital radiography, Radiobiology, Molecular, genomics and proteomics
DOI:
10.26044/esi2021/ESI-10181
Results or findings
The output of the simulation consisted of the energy deposition in the phantom as well as the position of secondary particles generated within the phantom.
The energy deposition derived from the incident Carbon(C) ion beam and from the secondary nuclear fragments, such Proton, Helium (He), Lithium (Li), Beryllium (Be), and Boron (B), was tallied spatial resolution.
Table 2 and Figure 2 show the depth of Bragg peak for various media.
Figure 3 shows the distribution of spread-out Bragg peak of 350 MeV/n carbon beams.
He fragments are the main contributors to the dose at 1 -30 cm, followed by Proton and B fragments. Proton and He fragments have the longest range and they contribute to the long energy deposition tail, while light ion fragments contribute to the dose more locally.
The energy deposition peak of the He ion is evidently larger than the other fragments. Contributions of other fragments, such as Li and Be ions, are not significant.
Figure 4 shows the dose distribution of mono and spread-out Bragg peak.
The contributions of the total secondary particles become more evident beyond the distal part of the Bragg peak. In the overall plateau region, the total dose of secondary particles contributed less than 0.01 on the total deposited dose registered at the same position and less than 0.01 at the peak position.
The contribution of total depth dose deposition behind the Bragg peak is only due to the secondary particles. This is because the primary carbon ion beam energy drops to zero drastically.