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Creating a clinically useable electron beam
50
Traditionally a single foil
technique was used
⇒
To get a broad enough beam
the single foil has to be quite
thick
⇒
Significant energy loss and
Utrecht 2016
spread.
The introduction of a secondary
foil downstream reduces these
problems since the total foil
thickness can be reduced
considerably.
ICRU 35 [8]