Dose Course 2018_Flipping book

Small fields: relative dosimetry - field size factor, S cp

measurement with a solid state detector (diode) energy dependence & fluence perturbation

(

)

(

)

A,z D ref

A,z M ref



   A A A A p det

( )

AS =

) p z AM det E, ref

=

cp

(

)

(

z AD

,

,

ref

ref

ref

ref

ref

≠1 for detector Ø



 A A

sensitivity of the detector

p

det E,

ref

Challenge: perturbation factors!