Advanced Physics for Brachytherapy 2018

The method …

• I know S

at each point

1sc

• I need a way to distribute this energy to all other points … i primD i i i i i )1 enμ μ ( Τ) μ enμ - (1 Ψ ) ρ enμ-μ ( K-Τ= 1scS − = = =

i

θ

r ) ,( ) ,( 1h , 1h    =

r

• Suppose

r sc

j sc 

dV R sc

1

is the fraction of 1sc energy released at a point (@ the origin) that is absorbed @ (r,θ), per unit of volume ) , ( 1 h  r sc • Can I calculate …. ? • From 1 st principles:

j

d





)(

 ( ) ,( 1 r = ,



)

1

d

exp( −  =

 r sc

h



 ) , 1



sc

 , 1 sc en r

2

dV R sc



r

1

) , ( 1h  r • Since I know the spectrum of 1sc photons, I can calculate sc