Dose Course 2018_Flipping book

OF measurements in a 6 MV beam using Pinpoint ion chamber (15 mm 3 ).

Energy dependence (non water equivalence central electrode)

Measured OF rel. 125 mm 3 ion chamber

Old PTW chamber 31006 with a central electrode of steel causing similar behaviour as an Si diode.

New PTW pinpoint chambers 31014-6 have aluminium central electrodes.

10%

Martens et al [12]