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Track structures and number of ionizations of a single 3 MeV α-particle and proton in water obtained with Geant4-DNA. The particles propagate along the Z-axis. When (a) one α-particle and (b) one proton traverse 1 µm of liquid water, the density of ionizations and the deposited energy (Etot) is about ten times higher for α-particles than for protons, due to the α-particle’s higher LET.
