[fluka-discuss]: Residual nuclei calculation: models or data libraries?

From: Firpo Gabriele <Gabriele.Firpo_at_ann.ansaldo.it>
Date: Tue, 2 Sep 2014 10:06:46 +0000

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

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?


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



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Received on Tue Sep 02 2014 - 13:49:09 CEST

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