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Literature on small MUs / short beam-on windows:
Accelerator dosimetry
Ramsey et al., Med Phys 1999
Results:
output <
±
0.8%
energy deviation < 0.4%
flatness deviation <
±
1.9%
mean 0.2
±
0.4 %
symmetry deviation <
±
0.8%
mean 0.1
±
0.2 %
clinically acceptable variations
Kriminski et al., J App Clin Med Phys 2006