Advanced Physics for Brachytherapy 2018

The LBTE

Rearranging the equation, and dropping notation for angular Φ and E distr. οf Φ (these can be discerned by the argument):



P 





 

pq

ˆ 

) ˆ,

Er

Er t

,(

+  

)ˆ, ,( scat q

p = + = 



(

−

)

pr r



1 4

Where: μ t is the total linear interaction coefficient q p is the primary photon density due to any of P point sources present at a phase space cell q scat is the scatter photon density

OK…!

Can I solve the LBTE for Φ …?