Dear Fluka users,
I know that the capability to score the residual nuclei has been implemented into FLUKA with an analytical solution of the Bateman equations describing activity build-up and decay during irradiation and cooling down, for arbitrary irradiation conditions.
As it is well known, the Bateman equation for the concentration Ni of isotope i in a material subject to a particle flux reads as
[
http://neutron.kth.se/courses/transmutation/Bateman/Eq1.gif]
where λd are decay constants , φ(E,t) is the magnitude of the particle flux of energy E and σij is the particle cross section for transmutation from isotope j to i (The sum is to be taken over all other nuclides j present in the material).
The question is: depending on particle irradiating type (neutron and proton in particular), does Fluka use data libraries and/or models to set the σij parameters on the Bateman equation? I suggest that data libraries are used for “low-energetic” neutrons (E<20 MeV) and models elsewhere. Is that true? If so, which kind of data libraries and models are used?
[S_ORANGE_Logo_Ansaldo_Nucleare_2014]
Gabriele Firpo
Unità Reattori e Sicurezza – Reactor and Safety Engineer
C.so F.M. Perrone, 25
16152 Genova - Italia
Ph: +39.010.655.83.42
www.ansaldonucleare.it<
http://www.ansaldonucleare.it/>
gabriele.firpo_at_ann.ansaldo.it<mailto:gabriele.firpo_at_ann.ansaldo.it>
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Received on Tue Sep 02 2014 - 13:49:09 CEST