From: Francesco Cerutti (Francesco.Cerutti@cern.ch)
Date: Mon Oct 08 2007 - 12:00:31 CEST
Dear Yung-Shun,
I have in fact to clarify that the choice of NEUTRONS as DEFAULTS' SDUM
is just intended to perform the transport of low energy neutrons (<19.6
MeV) within the multigroup treatment. So, coming back to your questions,
it is suitable ONLY for LOW energy neutrons. Since I saw that in your case
you have also neutron beams with energies > 19.6 MeV, for them you need to
perform nuclear interactions that indeed NEUTRONS neglect. Then, a
proper choice is either SHIELDINg or NEW-DEFA (not explicitly requested,
and good for MANY purposes). In the latter case, to avoid electromagnetic
treatment, just put the EMF card with SDUM=EMF-OFF and, to save further
time, put PAIRBREM with WHAT(1)=-3.0.
Moreover, in your input the EVENTYPE and MUPHOTON cards are useless as
well.
Finally, to perform one million histories, it is better to split them into
more cycles/runs (rfluka allows you to perform independent cycles in
sequence), this way you will have also the possibility of getting
statistical errors comparing the unformatted results of different cycles
with the standard postprocessing tools (e.g. usxsuw for USRBDX).
Thanks a lot to Alberto for pointing out these issues.
Cheers
Francesco
**************************************************
Francesco Cerutti
CERN-AB
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
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