Re: low neutron

From: Alberto Fasso' <fasso_at_SLAC.Stanford.EDU>
Date: Mon, 9 Apr 2012 06:58:35 -0700 (PDT)

Dear Mojdeh Najm,

to know if low-energy neutron cross sections are available for a given
element or isotope, you must look at Section of the Manual.
Some lanthanides are available (La, Ce, Nd, Sm, Eu, Gd, 159-Tb), but
Yb and Pr are not.
To turn off low-energy neutron transport, you must use LOW-BIAS with
WHAT(1) = 1.0 and WHAT(4-6) indicating the regions where you don't
waant low-energy neutron transport.


On Sat, 7 Apr 2012, mojdeh najm wrote:

> Dear Fluka users
> I want to calculate dose of Yb-169 and Pr-142 applied in different input
> separately but with setting NEW-DEFA, this error is appeared:
> "Low energy neutron xsec not found for some media 0 1 ** Ytterbiu or
> Presmodi" and in the Low Mat card, lanthanide group are not defined. how
> can i achieve true result via other setting? Is it correct that i turn off
> low neutron transport? How can I do it?
> It would be appreciate if you guide me with experiences and beneficial
> ways.
> Regards
> M. Najm
Received on Mon Apr 09 2012 - 16:51:01 CEST

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