Stopping power
The quantity stopping power (S) describes the release of energy (E) per unit of length (l). The quantity is related to radiation weighting factor (wR).Instead of the linear stopping power S (in MeV·m-1), often the mass stopping power S/ρ (in MeV·kg-1·m2) is used. Here, ρ (in kg·m-3) is the density of the material.