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The problem …
•
Point isotopic monoenergetic photon source in infinite medium
of given composition
•
If I know everything there is to know about the source and the
medium, can I calculate dose at a point i …?
r
i
D
scat
at point i, CANNOT be analytically calculated
NOT because of its stochastic nature, but due to the complexity of the calculation
i
i
ipr
prΨ)
ρ
enμ
(= prK D
For D
scat
at point i need
the depends on:
the probability of a primary photon interacting in one of a
number of possible interaction types
at every point of the
geometry
,
the probability distribution determining the new direction of a
photon and its energy degradation,
the probability this process is repeated due to multiple scattering
at every point of the geometry
i
sc
E
Ψ