Advanced Physics for Brachytherapy 2018

2004 AAPM TG-43U1 Brachytherapy Dosimetry Formalism

RAKR nearly identical to air-kerma strength S K

(distance specification)



( ) 

G r ,

L

(

)

( ) ( )  

D r ,

S =   

g r F r ,





K

L

(

)

G r ,



L 0 0



G r , ( ) L

( )   



G r ,

L ( ) ( g r F r ,  dose rate to water in water at point P( r ,  ) ) S 

S =   K =     ( ) 

D r ,

( ) 

( ) ( )  

L

D r ,

g r F r ,



(

)

( G r , L 0 0 G r ,  air-kerma strength K

L

)



L 0 0

S

K

dose-rate constant



g L ( r ) radial dose function

G L ( r ,  ) geometry function (line-source approximation)

F ( r ,  ) 2D anisotropy function