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V
(
)
1i
∑
ε
Beam of photons
secondary
(
)
∑
ε
(
)
2i
∑
ε
(
)
3i
∑
ε
Absorbed dose
E
dE
ρ
c
E
S
D
= Φ ⋅
⋅
∫
electrons
Energy absorbed in volume V =
where
is the sum of energy lost by collisions along the track of
the secondary particles
within volume V
.
(
) (
) (
) (
)
i
i
i
i
1
2
3
4
ε
ε
ε
ε
+
+
+
∑ ∑ ∑ ∑
Bremsstrahlung
4i
(
)
i
ε
∑