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1. Transport of primary photon fluence
•
Point source of primary photons at
•
No inscattering
•
Outscattering = attenuation
•
No electron transport
⋅
, ,
,
= −
, ,
,
( ) +
, ,
,
Ԧ − Ԧ
, ,
= −
Ԧ, Ԧ
, ,
,
4 Ԧ − Ԧ
2
− Ԧ, Ԧ
Ԧ
⋅
, ,
,
= −
, ,
,
( ) +
′
න
4
′
න
∞
′
′
, ,
′
,
′
′
→ , ,
′
,
′
; ,
+
, ,