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Detector size - the effect of volume averaging
•A chamber of cavity length of
24mm underestimates dose by
1.5% in the 6cm field
OAR(x,y) is the off axis distribution of field A in orthogonal directions x and y
Kawachi
el al
(2008), Med Phys 35 (10)
•A chamber of cavity length of
3mm underestimates dose by
0.5% in the 2cm field