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Step 1: The track length d to the next interaction of an individual photon
– starting from the entry point – can be anywhere.
For an individual photon it must be taken from a
distribution
determined by the
mean
free path length d
mfp
Individual particle tracking within the Monte Carlo method
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This is accomplished by a very
simple method:
d
sample
distance to the next interaction for this
individual photon
d
mfp
distance to the next interaction
on average
r
a random number out of the interval {0,1}
( )
r ln d
d
mfp
sample
⋅
−=