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2 '

2 '

2

'

'

CF

Fcal

t

measuremen

total

u

u

u

u

 

“The overall accuracy of entrance in vivo measurements is determined by

the combined uncertainty in the calibration factor, the correction factors

and the accuracy and reproducibility in diode position

In our case it is equal to

2% (1sd

).

So without any additional cause of

error 68% of all measurements would have a dispersion of

±

2% and 95%

of

±

4%.”

Essers and Mijnheer, Int.J.Radiat.Oncol.Biol.Phys., 1999

Tolerance limits and action levels