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shielded

diode

Unshielded

diode

Scanning results in a 5 MV X-ray beam using p-Si diodes.

Data from Scanditronix

Ion chamber

Unshielded

diode

Low energy in combination with large beams (here 5 MV and

40x40 cm

2

) displays the largest deviations for Si diodes.

Increasing fraction of

scattered low-energy

photons

Large fraction of

scattered low-energy

photons

Ion chamber

shielded diode