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Output factors for large fields using diodes

Shielded Si diodes for compensation

of photon energy dependence.

Scattered (low-

energy) photons

Silicon chip (2.3 g/cm

3

)

0.7

- Plastic

Incident beam direction

Based on figure by Eklund

et al

[6]

describing IBA Dosimetry diodes (EFD/PFD)

In PTW photon diodes

the backscatter shield

is made of steel instead.