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1. Lateral charged particle equilibrium (LCPE)
Charged particle equilibrium (CPE) requires that a homogeneous region contain a uniform source of charged particles distributed
around the point of measurement. When CPE exists at a point, the dose is equal to the collision kerma. In transient CPE the dose
is proportional to collision kerma.
The distance from the point of measurement to any point on the boundary must be greater than maximum range of the particles.