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DETECTORS FOR MEASUREMENT-2D/3D detectors

Transmission chambers

Dolphin”

(IBA)

David

(PTW)

Multiwire i.c.

Delta 4 TD

(Scandidos)

diode matrix

4040 diodes

1mm (disc shaped)

45

Utretch 2016

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

LIMITED SPATIAL RESOLUTION

NEED TO REMOVE ELECTRON

CONTAMINATION FROM THE HEAD

nº of wires = nº leaf pairs

Attenuation 5% (6MV)

Measures dose-length product

2.5 x 5 mm spacing

Attenuation 1% (6MV)

Sensitivity decrease:

0.04% per kGy

Dose measurement

accuracy 1.5%

MLC position accuracy

1mm