792 / 1224
( )
( )
(
)
( ) ( )
L
K
L
L 0 0
G r ,
D r ,
S
g r F r ,
G r ,
=
( )
( )
(
)
( ) (
)
L
K
L
L 0 0
G r ,
D r ,
S
g r F r ,
G r ,
=
2004 AAPM TG-43U1
Brachytherapy Dosimetry Formalism
dose rate to water in water at point P(
r
,
)
S
K
air-kerma strength
dose-rate constant
g
L
(
r
) radial dose function
G
L
(
r
,
) geometry function (line-source approximation)
F
(
r
,
) 2D anisotropy function
(
)
( )
(
)
( ) ( )
L
K
L
L 0 0
G r ,
D r ,
S
g r F r ,
G r ,
=
RAKR nearly identical to air-kerma strength
S
K
(distance specification)