Dose Course 2018_Flipping book

Energy dependence due to changing Stopping-power ratios (dose deposition due to electrons)

Collision stopping power ( S col

/ r ) ratios, norm. at 1 MeV

1.25

What is meant by “Energy dependence”? A varying relation between the detector signal and the investigated dose (water), caused by spectral changes of the beam.

1.20

1.15

Air (Ion chamber)

Silicon (Diode)

1.10

Carbon (Diamond)

Isooctane (LIC)

1.05

Medium / Water

1.00

0.95

0.90

0.01

0.10

1.00

10.00

100.00

Electron energy (MeV)