Course book Advanced Treatment Planning 2018

Energy lost = Dose deposition

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

• Heavy charged particle follow the Bethe-Bloch formula:

2 2

  

  

  

 I W cm 2 2 2 max 

2







ds dE

K

Z

1

2 1

2

e

  = − z

+ − SDBB

ln

(

)

2

A





1

−







• First approximation: 1/ v 2 → Bragg peak