Physics Athens 2016

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

Low energy

Ignoring brehmstralung

Dose Collision Kerma

Dose (Gy)

depth