593 / 1161
Energy lost = Dose deposition
• Heavy charged particle follow the Bethe-Bloch formula:
(
)
+ −
−
= −
SDBB
I
W cm
A
Z
z
K
ds
dE
e
2
2 2
max
2 2
2
2
1
2
ln
2
1
1
• First approximation:
1/
v
2
→
Bragg peak
H. Bethe: Annalen der Physik. 397, Nr. 3, 1930