1178-1179 / 2239
5.2
Known, unknowns
……………………….
(
)
(
)
(
)
att
prim ph, ,
scat ph, ,
phot
prim ph, ,
scat ph, ,
ph ph,
prim ph, ,
scat ph, ,
,
att
el, ,
el
el,
ph el,
prim ph, ,
,
,
d d
E
E
E
E
E
E
E E
E
E
E
E
E E
E
S
E
Ω
Ω
Ω
Ω
Ω
Ω
Ω Ω
Ω
Ω
Ω
Ω
Ω Ω
Ω Φ
Φ
σ Φ
Φ
σ
Φ
Φ
Ω
Ω Φ σ
Φ
σ
Φ
′ ′
′ ′
→
′
′
→ →
′ ′
→
′
′
→ →
′
′
⋅∇
+
+
⋅
+
=
⋅
+
∂
⋅∇ +
−
=
⋅
+
∂
∫ ∫
uur
uur
(
)
scat ph, ,
el el,
el, ,
,
d d
E
E
E E
E
E
Ω
Ω
Ω Ω
Ω
Φ
σ
Φ
Ω
′ ′
′ ′
→
′
′
→ →
′
′
+
⋅
∫ ∫
prim ph, ,
scat ph, ,
el, ,
the primary photon fluence raytraced analytically based on a beam source model
unknown
E
E
E
Ω
Ω
Ω
Φ
Φ
Φ
Wanted: the dose - calculated from the electron fluence
d d
D S
E
Φ Ω
= ⋅
∫ ∫
and wanted
att
phot
att
el
ph ph,
,
ph el,
,
el el,
,
E E
E E
E E
S
E
Ω Ω
Ω Ω
Ω Ω
σ
σ
σ
σ
σ
→
′
′
→ →
→
′
′
→ →
→
′
′
→ →
∂
∂
known from interactions physics
el, ,
E
E
Ω
Ω
7