Hello Sebastien and All,
Many thanks for this! I was using usxsuw program indeed!
Also the lectures about fluence are extremely useful!!
Many thanks,
Ana
________________________________________
De: wurth <wurth_at_ipno.in2p3.fr>
Enviado: 13 de julho de 2015 20:41
Para: Ferreira De Almeida Lourenco, Ana
Cc: fluka-discuss_at_fluka.org; owner-fluka-discuss_at_mi.infn.it
Assunto: Re: [fluka-discuss]: Understanding the difference between USRBDX and USRTRACK card
Hello Ana,
It seems that there is some 2 pi factor of difference between the peaks
of your USRTRACK/USRBDXs distributions.
If it is the case, that is probably because if you used usxsuw program
to compute your USRBDX results, you do not have to multiply (again) by 2
pi, the program already took care of that.
Please see this rather old but very useful discussion (especially the
fluence lecture by Alberto Fasso and Alfredo Ferrari which follows in
thread) :
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/0535.html
Best regards.
Sebastien.
Le 2015-07-13 16:20, Ferreira De Almeida Lourenco, Ana wrote:
> Dear Fluka experts,
>
> I simulated a proton beam in a target cylinder and I am scoring
> fluence in a ring detector that surrounds my target using a USRBDX and
> a USRTRACK card.
>
> Results from USRBDX card are integrated over solid angle and were
> normalized to the area of the detector and multiplied by the energy
> bin width and by 2pi (one-way scoring) in order to get fluence in
> units of cm-2.
>
> Results from USRTRACK card were normalized to the volume and
> multiplied by the energy width in order to get fluence in units of
> cm-2.
>
> I understand that USRBDX is a boundary crossing fluence (or current)
> estimator, and USRTRACK is a track-length estimator but I am
> struggling to understand the differences between these two cards when
> looking at my results.
>
> The graph below shows Fluence (cm-2/primary) differential in energy
> using a USRBDX card (outer boundary: from RING to AIR, inner boundary:
> from AIR2 to RING), and using a USRTRACK card.
>
> Why is the fluence from USRBDX higher than the fluence from USRTRACK
> card? I am aware that in some Monte Carlo codes the way how fluence is
> estimated is just valid to convex volumes/surfaces. Is this the case
> for FLUKA? In my geometry I am scoring fluence in a concave
> surface/volume.
>
> Please find in attachment my input file.
>
> Many thanks,
>
> Ana
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Received on Tue Jul 14 2015 - 15:23:27 CEST