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OF measurements in a 6 MV beam

using Pinpoint ion chamber (15 mm

3

).

Martens

et al

[12]

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.

Measured OF rel. 125 mm

3

ion chamber

Energy dependence (non water equivalence central electrode)

10%