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Shown (a) yD (or LETy) vs. y1D, (b) LETd vs. y1D and (c) yD vs. LETd calculated by Geant MC toolkit. The simulation consists of 106 particles in water phantom. A universal linear relation in low LET less than 5 keV/μm is visible. As LET increases a non-linear dependence emerges and the lines show slightly divergence because of energy loss straggling in the end of proton range.
