ESTRO course Dose Modelling and Verification 2017

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)

Edge of cavity

Edge of cavity

Air-density water Water

Silicon-density water

Cavity: 5mm radius, 2mm thick

Cavity: 2mm radius, 2mm thick

Bouchard et al, Med. Phys. 42 (10), 6048-61, Oct 2015 Hugo Bouchard, MV Photon Dosimetry; Small field considerations, NPL, Jan 2016