Dose Course 2018_Flipping book

1. Transport of primary photon fluence

Ԧ

• Point source of primary photons at • No inscattering • Outscattering = attenuation • No electron transport

∞

′ න

′

′ , ′

′ , ′ ; ,

⋅

,

= −

,

( ) +෍

න 4

+

′ , ,

′ → , ,

, ,

, ,

, ,

′

⋅

,

= −

,

( ) +

,

Ԧ − Ԧ

, ,

, ,

, ,

, , , 4 Ԧ − Ԧ 2

− Ԧ, Ԧ

= −

Ԧ, Ԧ

, ,