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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