TABLE 7.

Estimated uncertainty budgets of absorbed dose to water that determined at maximum depth ($z_{max})$ under reference conditions using modified calibration method.

Component	Uncertainty (%)
SSD setting	0.10
Positioning the chamber	0.17
Field size setting	0.10
$P_{TP}$ correction	0.10
$P_{ion}$correction	0.10
$P_{pol}$correction	0.05
$P_{elec}$correction	0.07
Humidity	0.05
Charge measurement	0.23
Beam quality conversion factor ($k_{Q,Qo})$	0.40
Total uncertainty	0.54