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Detector composition: b) density of sensitive volume
Detector response in small photon fields has been recently investigated in detail by Bouchard
et al
by
calculating the absorbed dose in the detector cavity as a sum of absorbed doses from
1.25MeV pencil
beams
incident on cavities with different densities (cavity of 5mm radius and 2mm thickness)
Bouchard et al, Med. Phys. 42 (10), 6048-61, Oct 2015
Hugo Bouchard, MV Photon Dosimetry; Small field considerations, NPL, Jan 2016
Air-density water
Water
Silicon-density water
Cavity:
5mm radius,
2mm thick
Cavity:
2mm radius,
2mm thick
Edge of cavity
Edge of cavity