Biomedical Engineering Reference
In-Depth Information
Fig. 7.1
Calculated track segments (0.7
µ
m) of protons and
alpha particles having the same velocities in water. (Courtesy
Oak Ridge National Laboratory, operated by Martin Marietta
Energy Systems, Inc., for the Department of Energy.)
specified value
. To calculate this quantity, one integrates the weighted energy-
loss spectrum only up to
, rather than
Q
max
. In place of Eq. (5.10) one defines the
restricted stopping power as
-
d
E
d
x
(7.1)
=
µ
QW
(
Q
)d
Q
.
Q
min
