Dear Paola,
Thank you very much for your answer. It is of great help. I will keep reading about the topic to be able to choose the number of primaries for my simulations.
Regards,
Luis
El Lunes 24 Junio 2019 15:46 CEST, "Paola Sala" <paola.sala_at_mi.infn.it> Ha escrito:
> Dear Luis,
> The number of primaries to be run depends a lot on the setup that you want
> to simulate.
> In order to evaluate your statistical error with Fluka, one should run
> many "cycles" of the same sun, and use the standard fluka tools to combine
> the results. These tools calculate errors by looking at the variations
> among cycles. The number of cycles shall be at least 5 or 10, the number
> of primaries as many as possible to have a reasonable CPU time (say few
> hours per cycle).
> Statistical errors are printed in the .lis and .tab files, while for
> USRBIN they can be plotted with Flair (checking the "errors" option in
> the plot page)
> So, first try, look at first results,
> then, increasing the number of primaries per cicles and/or the number of
> cycles will improve the statistical error.
> If CPU is not enough.. bias can help.
> You can have a look at the slides from past user courses fr more details
> Hope this helps
> Paola
>
> > Hello Sebastien,
> >
> > Thank you very much for your fast answer. I am working on that hint and I
> > am obtaining some results.
> >
> > However, I wanted to ask some basic questions concerning the primaries.
> > What is the difference between simulating 1000 or 10000 primaries? How
> > many should I simulate to get good statistics?.
> >
> > Regards,
> >
> > Luis
> >
> > El Miércoles 19 Junio 2019 12:59 CEST, Sébastien Wurth
> > <wurth_at_ipno.in2p3.fr> Ha escrito:
> >
> >> Hello Luis,
> >>
> >> Just a little hint, you should try to obtain dose rate in µSv/h on your
> >> plot.
> >>
> >> In order to do this you have to know your beam intensity to convert
> >> primary in number of particules per unit time.
> >>
> >> Do it in the normalization box displayed in the plotting layout.
> >>
> >> Then you look at the duration of beam emission during the year and you
> >> check whether it complies with the 1 mSv limitation.
> >>
> >> Hope it helps.
> >>
> >> Regards.
> >>
> >> Sebastien.
> >>
> >> Le 19/06/19 à 08:07, Luis Eduardo Gonzalez Amoros a écrit :
> >> > Dear FLUKA experts,
> >> >
> >> > I write because I am simulating the shielding for a LINAC accelerator
> >> and I am having some doubts.
> >> >
> >> > I have created all the structure that I need for the moment, I have
> >> simulated 10000 primaries and 5 cycles and I have plotted the 2D
> >> EQ-DOSE USRBIN card. Thus, I guess I am getting the result in
> >> pSv/primary. However, I don't know how to get the equivalent dose for
> >> the whole year and check if outside the bunker it is bigger than 1msV.
> >> >
> >> > Could you explain me how to do this and/or suggest me where I can find
> >> some clear explanation?
> >> >
> >> > Attached I leave my code in case it helps to understand what I am
> >> trying to simulate.
> >> >
> >> > Regards,
> >> >
> >> > Luis
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >
> >
> >
> >
> >
> >
> > __________________________________________________________________________
> > You can manage unsubscription from this mailing list at
> > https://www.fluka.org/fluka.php?id=acc_info
> >
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
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Received on Wed Jun 26 2019 - 00:42:21 CEST