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Chaney E L
et al
1994 A Monte Carlo study of accelerator head scatter
Med. Phys.
21
1383-9
Distribution of origin site.
Note clouds at beam stopper,
primary collimator and
flattening filter
Lateral distribution of origin
sites, projected to a
common distance from the
target.
Mevatron & EGS4
All scatter sources
merged to an effective
source distribution.
Flattening filter scatter
the major extrafocal contribution
Monte Carlo proof: