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Detector composition: d) extracameral effects
Extra-cameral components refer to walls, electrodes, stems. These also affect detector response
Monte Carlo simulations of cavity dose response to 1.25MeV photon pencil beams with the cavity
surrounded by a wall
Air cavity:
5mm radius,
2mm thick
+ graphite wall
Silicon cavity:
2mm radius,
2mm thick
+
aluminium wall
Bouchard et al, Med. Phys. 42 (10), 6048-61, Oct 2015
Extracameral perturbation effects can be significant in comparison to density perturbation effects
Edge of cavity
Edge of cavity