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Principle of absorbed dose measurements
Reference conditions
D
w,Q
= M* · k
i
·N
D,w
N
D,w
= α ·k
l
·f
Q,ideal
·P
Q
Detector: air (ionisation chamber)
Med:
Water
For reference irradiation conditions:
Fixed field size
10x10 cm2
Fixed depth
10cm
Fixed SSD
100cm
Calibrated in terms of water absorbed dose in
60
Co-radiation in units of Gray per Coulomb