Advanced Physics for Brachytherapy 2018
The method
➢ Energy is divided in g=1,.., G groups of width ΔE g
so that energy decreases as group
order decreases
P
gpq
,
ˆ
rg
rg gt
, )ˆ,(
( = + = + 1 4 , )ˆ,( p g scat q −
)
)1(
pr r
l
G
=
m
q
rg scat
)( rg gls −
r gml
)( Y
)ˆ,( , =
) ,(
)2(
' ,,
' , ,
l
l
1' l m g =
0
−=
Our equations become:
gE −
gE −
1 1'
dE dE Er E Erls
,(,
→
' )' ,( )
' gE rg gls = − )(
gE
)3(
' ,,
gE −
1
dEEr
) ,(
gE
gE −
gE −
1
1
r gml
dEEr
' )ˆ( )ˆ, ,( l Y Er
dE d m
)(
=
) ,( =
)4(
ml
, ,
,
E
4
gE
g
gE −
1
)' ,( ) ,( dE Er Ert
gE
rgt
)( , =
)5(
gE −
1
Er
) ,( dE
gE
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