Dose Course 2018_Flipping book

When moving away from reference conditions the detector will face differences in:

Small fields

Less scatter photons, beam hardening

Energy fluence

6 MV, d

max

For high energy x-rays

Photon energy fluence changes with field size and depth

Dose rate

6 MV, 15 cm depth

Yin et al. PMB 49 (2004)