Abstract:

The angle straggling and energy straggling of ¹²C⁶⁺ beam were simulated with  method of Geant4. And the energy of   ¹²C⁶⁺beam ranged from 80 MeV to 360 MeV per nucleon, while the mass thickness of the target, PMMA,Al,Cu,Pb, ranged from 0.5 g/cm2 to 4.0 g/cm². Besides, the Bragg peak of ¹²C⁶⁺ beam which have passed through range shifter was compared to the Bragg peak of mono\|energetic ¹²C⁶⁺  beam. The results of the simulation show that the energy of ¹²C⁶⁺  beam is higher, the thickness and atomic number of the target is lower, then the angle and energy straggling of ¹²C⁶⁺  beam after range shifter is lower, the effect of its Bragg peak is minimal. So, in the case of only consider the angle and energy straggling, the target of lower atomic number is more suitable for range shifter.

Key words:  Geant4 simulation, angle straggling, energy straggling, Bragg peak