Overall Uncertainty in Dose Delivery

Per Khan Ed 3, Table 17.4, pg 431.

Step Uncertainty (%)
Ion chamber calibration 1.6
Calibration procedure 2.0
Dose calc parameters and methods 3.0
Effective depth 2.0
SSD 2.0
Wedges 2.0
Blocking Trays 2.0
CUMULATIVE 5.6