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Fermi-Eyges for electrons
Referring to a Cartesian coordinate system (x,y,z ) and an electron, incident
perpendicularly on a medium at (0,0,0) in the z direction, the Fermi–Eyges
expression for the probability of finding the electron at depth
z
with
displacement between
x
and
x+
d
x
,
y
and
y+
d
y
is
7
Where
T(u)
is the linear scattering power of the medium at depth
u
Utrecht 2016
From Handbook of Radiotherapy Physics
Ed Mayles, Nahum and Rosenwald