Dose Course 2018_Flipping book

Uncertainties

• Published studies on EBT, red channel, uncertainty between 0.9% and 2% depending on the procedure.

• None of these uncertainty calculations take into account the uncertainty in the dose measured by the ionisation chamber. (Reference conditions: relative standard uncertainty 1.5% for high energy X-ray beams (TRS398)).

• Uncertainty is reduced using 3 channel methods. The uncertainty depends on the model used for channel combination

(Mendez et al. MP 41(1) 2014).