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X
Y
Ω
da
da
da
Establish "tubes" within the volume of differential cross
section
da
and differential length
h
i
(x,y)
The differential number of particles N with direction
Ω
is
d ( )
( ) dΩd
N
a
Ω
Ω = Φ Ω ⋅
ur
ur
∆
V
h
d (Ω)
d
h(x,y) = (Ω) d d h(x,y)
( )
L
N
a
Ω
=
Ω ⋅
Φ Ω ⋅
ur
ur
ur
The number of particles
differential in track length dL is
56