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)
A The alignment of the centre of the beam with the centre of the flattening filter.
B The specific shape of each flattening filter.
C The signals from the two halves of the monitor chambers used to centre the beam by varying the current through the beam bending magnets.
D The presence of a flattening filter.
E The angular cross section of bremsstrahlung production.
F The use of a grid in a triode style electron gun.
G The uniformity of an electron scattering foil.

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