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The method …

•

Let us start again from the simplest case (point

isotopic monoenergetic photon source in infinite

i

medium of given composition)

•

at any point I know more than D

prim

:

)ir

exp(

2

ir4π

R =Ψ R







i

r

i

i

Ψ)

ρ

μ(=T

i

i

i

i prim

Τ)

μ

enμ( Ψ)

ρ

enμ(=K D : CPE

under





i D

i

i

i

i

i

)1 μ ( Τ) enμ (1 Ψ) enμ-μ( KΤ=S







f k h

f h

k h

i

pr m

i

enμ

μ

-

ρ

(

-





•

I I now t e spectrum o t e source I now t e

amount of energy per unit mass scattered in first

interactions of primary photons, S

1sc