Which of the following contribute to improving the flatness of the beam fluence profile?

Which of the following contribute to improving the flatness of the beam fluence profile?
(more than one possible correct answer – select all correct statements)
AThe alignment of the centre of the beam with the centre of the flattening filter.
BThe specific shape of each flattening filter.
CThe signals from the two halves of the monitor chambers used to centre the beam by varying the current through the beam bending magnets.
DThe presence of a flattening filter.
EThe angular cross section of bremsstrahlung production.
FThe use of a grid in a triode style electron gun.
GThe uniformity of an electron scattering foil.
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