A path length correction may be applied in an approximate manner.
We have from the Fermi-Eyges theory []
0t
where
2 |
|
| |
|
We have further:
2
0
is the radiation length. From () and
(
) we get
2withK = 1.12 x10-4&sp;{Zinc2
Equation ()
may be used to make the path length correction. Solving equation
(
) with respect to t implies that, in order to
obtain real solutions:
0p2β2
This condition provides an additional constraint to the maximum step length for multiple scattering (variable TMXCOR in routine GMULOF). The corrected step can be approximated as:
where CORR
due to condition ().
F.Carminati