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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).