Dose Course Book

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5.2 d ε
d
D
m
=
mean energy imparted
R
in
Radiation energy entering a volume
(electrons, photons)
The term “energy imparted” refers to a balance of
radiation energy entering and leaving a volume of mass:
ε = R
in – R
out +ΣQ
R
out
ΣQ V
In the volume there are:
- many interactions
- ΣQ is the change of rest energies of
all particles involved in the interactions
Radiation energy leaving the volume
Energy imparted:
5