ESTRO 2024 - Abstract Book

S3405

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Results:

Table 1 shows the simulated and experimentally determined G-values for electrons, protons and carbon ions. For protons and carbon ions the values show good agreement within 7%. The experimental G-value for electrons is about 2 times larger than the simulated one.

Table 1: Measured and simulated G-Values for carbon ions, protons and electrons.

Energy in MeV/u

Simulated

Measured

G-Value

G-Value

C12

149

0.91 ± 0.01

0.875 ± 0.03

P

220

0.69 ± 0.012

0.746 ± 0.08 1.230 ± 0.05

E

6

0.64 ± 0.01

Fluorescence as a function of dose for different particles. The uncertainty is given by the standard deviation.

Figure 1 shows the different dose curves. The electrons show the greatest slope, which is two times larger than the slope of the protons. The ratio between the slope of the carbons and the ions corresponds to the ratio of the simulated G-values for both species.

Conclusion:

The results will be used to benchmark results and dependencies from simulations. The accuracy of the formation of chemical radicals is particularly important for further simulations of indirect DNA damage. The behaviour of the G-