Re: [fluka-discuss]:

From: Stefan E. Mueller <>
Date: Mon, 31 Jan 2022 16:43:33 +0100 (CET)

Dear Mohammed,

FLUKA uses the central limit theorem to estimate a gaussian standard
deviation on the scored results (see
for an explanation of the method).

For this, FLUKA requires to have at least 5 independent runs (this is the
default when running with FLAIR, and is done on the commandline by giving
the "-N" and "-M" flags:
$FLUPRO/flutil/rfluka -N0 -M5 ./input
). Of course one can also do more runs.

Then when you process the runs for a given scorer (either from FLAIR's
"Process"-Button in the "Run"->"Data"-menu or on the commandline with the
corresponding program in $FLUPRO/flutil), the standard deviation is
calculated and can be obtained from the _tab.lis-file or plotted in FLAIR
(giving the "Type" "errorbars" for 1d-plots, or checking the
"errors"-box for USRBIN plots which in this case will give you the
relative fractional errors).



Stefan E. Mueller
Department of Information Services and Computing - Computational Science
and Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Tel: +49 (0351) 260 3847
Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
Vereinsregister: VR 1693 beim Amtsgericht Dresden
On Wed, 19 Jan 2022, MOHAMMED YJJOU wrote:
> Hello to all,How can I find  the simulation statistical accuracy of fluka ?
> Thanks.
> --
> Laboratoire de Physique Théorique, de Particules et Modélisation (LPTPM)
> Faculté des sciences d'Oujda
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Received on Fri Feb 04 2022 - 20:28:46 CET

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