The lineal energy distribution for each secondary heavy charged particle is estimated using a F6 tally type for energy deposit coupled to a pulse height tally F8 for each heavy charged particle specie. An anticoincidence pulse height card, i.e., “ft8 phl”, is added to the F8 tally for counting single-event of energy imparted in gas arising from specific nuclear reaction in the cavity wall. For example, the following instructions are set to determine the occurrence number of reaction in the gas. For setting up this card, 185 logarithmic lineal energy bins are defined to ensure about 50 equal subdivisions per decade between 0.6 and 3030 keV/μm−1. In the command lines hereafter, this card provides the lineal energy spectrum for
all charged particles:
F6:h,a,# 10 $ 10 is cell of the internal cavity
F8:N 10
E8 0 1.39E-11 0.0004 183LOG 2.02
FT8 PHL 1 66 1 0 $ for He-3 and gas is material 1
after that you must calculate y (y=e/l with l the the mean chord of your detector)
and yd(y)
there are some adjustments to take into account for the MCNP parameters, for that please read the publications I cited.