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measurement with an ionisation chamber

fluence perturbation

Challenge: perturbation factors

A

: field size (aperture)

z

ref

: reference depth

 

 

A

A

A

A

p

ρ

S

z AM

zAM

z AD

A,z D

AS

ref

ref

det

w

air

ref

ref

ref

ref

ref

w

ref

w

cp

,

,

,





Small fields: relative dosimetry - field size factor, S

cp