936 / 1359
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