| 单词 | stopping power |
| 释义 | stopping power A measure of the ability of matter to reduce the kinetic energy of a particle passing through it. The linear stopping power , -dE/dx, is energy loss of a particle per unit distance. The mass stopping power , (1/ρ)dE/dx, is the linear stopping power divided by the density (ρ) of the substance. The atomic stopping power , (1/n)dE/dx = (A/ρN)dE/dx , is the energy loss per atom per unit area perpendicular to the particle's motion, i.e. n is the number of atoms in unit volume of the substance, N is the Avogadro number, and A is the relative atomic mass of the substance. The relative stopping power is the ratio of the stopping power of a substance to that of a standard substance, usually aluminium, oxygen, or air |
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