Advanced TP

Energy lost = Dose deposition

H. Bethe: Annalen der Physik. 397, Nr. 3, 1930

• Heavy charged particle follow the Bethe-Bloch formula:

   A Z z K 2 1   

  

  I W cm 2 2 2 max β

2 2

( 1 2 ln e

1

ds dE

β

⋅

⋅

⋅ ⋅ = − 2

+ − SDBB

)

2

ρ

β

β

−

⋅

• First approximation: 1/ v 2  Bragg peak