Advanced Physics for Brachytherapy 2018

The method

➢ We have separated r and E, from direction variables and turned integration to summation for direction in the scatter source

P q p

ˆ

ˆ

ˆ

( , , ) r E   +   = + ( , , ) r E q

r r −

t 



(

) (1)



scat

p

41 

p

=

 

l

m

ˆ ( , , )

( , r E E 

( , ) 

q r E scat

r E Y

( , ) ' dE  

 =



) → 

(2)

0 0 1 l m l    = =−

, s l

l

, l m

ˆ ˆ

ˆ ˆ

ˆ ˆ

( , r E E 

, r E E 







) ( P →    ) ( d



→ =

) 1/ 2 ( , 

)

(3)



, s l

s

l

−

1

m E Y

ˆ

ˆ

( , ) r E 

( ) ' d      

r



=  

(

, , )

(4)

l

, l m

4



Let us continue with E …