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General simplifications
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Particle types
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Consider only photons and electrons
•
Positrons are treated as electrons
•
Interaction types
•
Photons can produce electrons, electrons cannot produce photons
•
Bremsstrahlung neglected
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Primary and scattered fluence
•
No internal source of primary radiation
•
External source of primary fluence
•
Raytracing of primary fluence
⋅
, ,
,
= −
, ,
,
( ) +
′
න
4
′
න
∞
′
′
, ,
′
,
′
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→ , ,
′
,
′
; ,
+
, ,