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Hello, non-ionizing energy loss of neutral and charged particles are simulated a bit differently: - for heavy charged particles at low energy (<1 MeV) we use ICRU49 parameterisation and this energy poss is added to the total energy deposition at a step; - in the UserSteppingAction class or in a sensitive detector class one can access to G4Step object from which get total energy deposition at a step and non-ionizing energy deposition at a step; - how this can be done in ALICE software - please consult experts; - it may be useful to study the subject in a standalone Geant4 application or in Geant4 examples provided together with the toolkit. Now about one Geant4 feature you need to know: there is so called "cut on proton", which should be defined by users as other Geant4 cuts in range. In the run time it is converted in the energy threshold in energy. This cut for proton is used by elastic models (hadronic or electromagnetic) to decide if recoil nucleus should be created as a Geant4 ion and further tracked. If recoil energy is below the threshold then such particle is not created but its energy is added to non-ionizing energy loss. So, is the cut for proton is zero no extra non-ionizing energy loss will be scored (for example, no non-ionizing energy loss for neutrons) but extra ion will be created as a secondary particle. If the cut for proton is non-zero then some extra non-ionizing energy loss will be added to the G4STep object. Of course, the energy of the projectile hadron will be reduced by the same value. VI