In radiological physics, charged-particle equilibrium (CPE) occurs when the number of charged particles leaving a volume is equal to the number entering, for each energy and type of particle. When CPE exists in an irradiated medium, the absorbed dose in the volume is equal to the collision kerma. ...
condition existing at a point within a medium under irradiation, when, for every charged particle leaving a volume element surrounding the point, another charged particle of the same kind and energy entersthe condition existing at a point within a medium under irradiation when, for every charged particle leaving a volume element surrounding the point, another charged particle of the same kind and energy enters