Re: [fluka-discuss]: regarding relative error in USRBIN X-Y-Z and REGION

From: Andrea Fontana <>
Date: Thu, 1 Nov 2018 15:17:24 +0100

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:


Il 01/11/2018 10:44, Ševčik 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:
Via Bassi 6                           web   :
27100 PAVIA, Italy
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Received on Thu Nov 01 2018 - 16:46:02 CET

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