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Fermi-Eyges for electrons
Can be divided as
p(x,y,z)=p(x,z) p(x,y)
where both are given as
This is a Gaussian, or normal distribution, and s can be identified as the
standard deviation , which is a measure of the width of the distribution. As
the depth increases,
MCS
increases and the pencil spreads out.
Integration of a Gaussian is written with the erf function
Warsaw 2017
9
From Handbook of Radiotherapy Physics
Ed Mayles, Nahum and Rosenwald