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Absorbed dose
in terms of interaction coefficients
col
K D
CPE
=
Φ
=
E
D
µ
en
CPE
mono-energetic
dE
E K
en
E
col
ρ
µ
⋅Φ⋅
=
∫
ρ
beam
( )
dE
E
E D
E
E
Φ =
∫
ρ
µ
en
0
CPE
max
poly-energetic
beam