From Geant3 to Geant4:
a brief overview of the electromagnetic physics

Gamma incident

• Gamma conversion
• Compton scattering
• Photo electric effect
• Rayleigh scattering

Optical photon

• Rayleigh scattering
• Absorption
• Reflection-refraction

Common to all incident charged particles

• Multiple scattering
• Transition radiation
• Scintillation
• Cerenkov effect

Electron incident

• Ionisation
• Bremsstrahlung
• Synchrotron radiation
• e+ annihilation

Charged hadron incident

• Ionisation

Muon incident

• Ionisation
• Bremsstrahlung
• direct (e+,e-) production
• muon nuclear interaction

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