Table 1

Calculated values		Measured values
Components for calculated values	Relative standard uncertainties	Components for measured values	Relative standard uncertainties
Dose calculation of the treatment planning system	1.0%	Positioning of cylindrical PMMA phantom	0.3%
Basic data measurements	0.3%	Response of ionization chamber	2.0%
		directionally response of ionization chamber by rotation of the chamber around its axis by more than 10°	0.1%
Total	1.0%		2.2%

Table 1: Uncertainty budget.