Dose Course 2018_Flipping book

Transmission chambers

“ Dolphin” (IBA)

David (PTW)

Delta 4 TD (Scandidos)

Multiwire i.c. nº of wires = nº leaf pairs

diode matrix 4040 diodes

Attenuation 5% (6MV) Measures dose-length product

1mm (disc shaped) 2.5 x 5 mm spacing Attenuation 1% (6MV) Sensitivity decrease: 0.04% per kGy

pp i.c. matrix 1513 i.c. 0.02 cm 3– 5mm center to center Attenuation 1% (6MV) Measures dose fluence MC modelling of detector reponse

Dose measurement accuracy 1.5%

MLC position accuracy 1mm