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Charged Particle (=Electronic) Equilibrium
Charged particle equilibrium (CPE) exists if for each charged particle with
energy E leaving a volume, there is an identical particle with same energy
E entering that volume
Low
energy beam enters surface:
KERMA
is max because fluence is
greatest at surface
Low
energy beam:
KERMA = Dose
because the energy is deposited at the
interaction point
Dose
Collision Kerma
depth
Dose (Gy)
Low
energy
Ignoring brehmstralung