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1. I need to be efficient Equation for the transport of scerma
generated at each point along a
transport line
S { Δr [1 exp( Δr )} 1sc,1 1 1
D D D 0
1sc1 1sc0 1 1sc1 1
Δr1
b b
B
b b
 

 
 − − −
= + = +
→ →
D D D
1sc2 1sc1 2 1sc2 2
S ρ S
[1 exp( )][1 exp( 2)] { Δr [1 exp( Δr )} 1sc,1 1 1sc,2
1 2 2
ρ Δr
2 2 2
B b r b r b b
B
b b r b b
    

   
= + =
→ →
 
− −  − −  − − −
+

1 S ρ [1 exp( )][1 exp( )] 1sc,i-1 i-1 1
D D D
1sc 1sc 1 1sc ρ Δr i i 1
S { [1 exp( )]} 1sc,i
i B b r b r
i i
i i i i i b b
i
b r b r
i i
B
b b ri
  
 
 

 
−  − −  − − 
−
= + = +  
− → →
  − − − 
+

...
331sc D3
21scD311sc D31scD =→ +→ +→ =