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Dose calculation accorging to
AAPM TG - 43
( )
( )
(
)
( ) ( )
=
,
,
,
,
0 0
rFrg
rG
rG
T S rD
k
S
k
…
Air kerma strength … Geometry factor
…
Dose rate constant g(r) … Radial dose function
T
...
Total time F(r,
) … Anisotropy function
) , (
) ,(
0 0
rG
rG
Simple approximation with most varying factors:
2
1
r
TD