ESTRO course Dose Modelling and Verification 2017

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Transmission chambers

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

“

Dolphin”

(IBA)

David

(PTW)

Multiwire i.c.

nº of wires = nº leaf pairs

Attenuation 5% (6MV)

Measures dose-length product

Delta 4 TD

(Scandidos)

diode matrix

4040 diodes

1mm (disc shaped)

2.5 x 5 mm spacing

Attenuation 1% (6MV)

Sensitivity decrease: 0.04%

per kGy

Dose measurement accuracy

1.5%

MLC position accuracy 1mm