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5.2
Establishing a "transport formula"
(2) The number of particles j that are attenuated in
∆
V:
Introducing as the probability per
unit path length
for particle j of energy E and direction
Ω
to attenuate, we
have:
,
j att
σ
VL
dd
=Φ
,
d
d d d
j att
j
V
E V
=
⋅ Φ Ω
∫
σ
34
L
N
dv
dd
d
j,att
j,att
∫
Ω⋅
σ=
V
L
d
d
⋅Φ=