Dear Andrea,
Thank you very much. As bins are much smaller than a typical region, the error gets much higher, which makes sense,
Alex
-----Original Message-----
From: Andrea Fontana <andrea.fontana_at_pv.infn.it>
Sent: Thursday, November 1, 2018 16:17
To: ©evèik Aleksandras <aleksandras.sevcik_at_ktu.edu>; fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: regarding relative error in USRBIN X-Y-Z and REGION
Dear Alexander,
when you request a region based or a cartesian based scoring in Fluka, you are evaluating two different quantities:
- in the first case (region), you are globally evaluating the
average value of your score (let us say the deposited energy) over
the whole region;
- in the second case (cartesian binning), you are locally evaluating
your score in each single bin of your mesh.
The statistical errors calculated by Fluka reflect this difference.
Perhaps this is not clearly stated in the manual, but you can find some (hopefully) helpful details in these old discussions:
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/10023.html
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/6342.html
Andrea
Il 01/11/2018 10:44, ©evèik Aleksandras ha scritto:
>
> Hello all,
>
> I am doing the simulations in which scoring USRBIN Dose/DepEnergy in
> X-Y-Z and Region. When I look in the scored Region output files,
> typically I see very small error % value (<1%) for almost all the
> regions, however, when I check X-Y-Z bin file (usually through
> SimpleGeo) I see that error % is typically very high for the most of
> regions except maybe only in areas directly affected by the beam. I
> understand that I missed some important information about how Fluka
> calculates relative error for different scoring tools. Could someone
> please comment or give the link where to read further on this matter
> as I, unfortunately, cannot find explanation ,
>
> Attached two files for illustration, usrbin region scoring txt and
> illustration of usrbin xyz scoring for error values
>
> Regards
>
> Alexander
>
--
========================================================================
Dr. Andrea Fontana tel: +39 0382 987991
Istituto Nazionale fax: +39 0382 423241
di Fisica Nucleare
Sezione di Pavia e-mail: andrea.fontana_at_pv.infn.it
Via Bassi 6 web : www.pv.infn.it/~fontana
27100 PAVIA, Italy
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Received on Thu Nov 01 2018 - 18:20:14 CET