Table 1.

Measurement devices with assessed beam dimensions, their manufacturers, purpose, and nominal tolerances used during this study

Device (X × Y cm2)	Manufacturer	Purpose	Nominal Tolerances
Daily QA™ 3 (20 × 20 cm2)	Sun Nuclear Corporation, Melbourne, USA	Output, symmetry	±3%
30013 Farmer ionization chamber (IC) in Solid Water (10 × 10 cm2)	PTW, Freiburg, Germany	Output	±2%
SNC Machine™ FS‐QA (15 × 15 cm2)	Sun Nuclear Corporation, Melbourne, USA	Symmetry	±2%
MPC (13.3 × 13.3 cm2)	Varian Medical Systems, Palo Alto, CA, USA	Output, uniformity	±2%