Hi Javier,
the reason, as already explained by Vasilis, is the multigroup
treatment of low energy neutrons the overrides any user binning.
It is also well written in the manual, under USRBDX (note 6).
You can also find previous discussions in the forum about this
topic. See for example:
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/3381.html
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/4166.html
Hope this helps,
Andrea
Il 04/07/2017 12:05, Javier Lozano Díaz ha scritto:
> Hello again Fluka experts.
>
> Sorry but I continue with this doubt
>
> I write again the email.
>
> /"Thank you for the answers but I continue having doubts in the first
> one:/
> /
> /
> /I use electrons and protons as a source, I have activated the
> photoreactions and it is created neutrons, but anyway if you see the
> energy binning, being score is "LinE LinAngle", is not linear, for
> example, Emin=30 Emax=300 in 100 bin, you can see that the difference
> is sometimes 0.5, others 0.2, the last are 1 or others the diferecence
> is 0. So you can not obtain the dose as sum of all contributions and
> then multiplique By the width of the bin./
> /
> /
> /Thank you again./
> /
> /
> /Regards."/
>
> ---------- Forwarded message ----------
> From: *Javier Lozano Díaz* <jlozano_at_clpu.es <mailto:jlozano_at_clpu.es>>
> Date: 2017-06-29 15:30 GMT+02:00
> Subject: Re: [fluka-discuss]: Problems with USRBDX
> To: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch
> <mailto:Vasilis.Vlachoudis_at_cern.ch>>
> Cc: "fluka-discuss_at_fluka.org <mailto:fluka-discuss_at_fluka.org>"
> <fluka-discuss_at_fluka.org <mailto:fluka-discuss_at_fluka.org>>
>
>
> Hello Vasilis.
>
> Thank you for the answers but I continue having doubts in the first one:
>
> I use electrons and protons as a source, I have activated the
> photoreactions and it is created neutrons, but anyway if you see the
> energy binning, being score is "LinE LinAngle", is not linear, for
> example, Emin=30 Emax=300 in 100 bin, you can see that the difference
> is sometimes 0.5, others 0.2, the last are 1 or others the diferecence
> is 0. So you can not obtain the dose as sum of all contributions and
> then multiplique By the width of the bin.
>
> Thank you again.
>
> Regards.
>
> 2017-06-28 9:11 GMT+02:00 Vasilis Vlachoudis
> <Vasilis.Vlachoudis_at_cern.ch <mailto:Vasilis.Vlachoudis_at_cern.ch>>:
>
> Dear Javier,
>
> 1st. Scoring quantities that uses all particles in USRBDX,
> USRTRACK...
> for low energy neutrons (20MeV) will use always the neutron
> group structure,
> while for all other particles it will use the binning that
> you requested.
> Therefore you see in your case 260 n groups +400 bins
>
> 2nd. FLUKA doesn't have the impact ionization cross section for
> protons
> so what you get at high energies of protons is indirectly
> through other
> processes.
>
> Vasilis
> ------------------------------------------------------------------------
> *From:* owner-fluka-discuss_at_mi.infn.it
> <mailto:owner-fluka-discuss_at_mi.infn.it>
> [owner-fluka-discuss_at_mi.infn.it
> <mailto:owner-fluka-discuss_at_mi.infn.it>] on behalf of Javier
> Lozano Díaz [jlozano_at_clpu.es <mailto:jlozano_at_clpu.es>]
> *Sent:* Tuesday, June 27, 2017 08:31
> *To:* fluka-discuss_at_fluka.org <mailto:fluka-discuss_at_fluka.org>
> *Subject:* [fluka-discuss]: Problems with USRBDX
>
> Hello Fluka experts.
>
> I was simulated a shielding with an electron beam and I use some
> USRBDX scoring cards. The problem is when I check the result of
> tab.list or sum.list of this detectors and I find more binns in
> Energy than I have written in the card. For example if I put 1200
> fluka count 1650, I have reduced to 400 but then appears 660, if
> you check the datas one by one you will find binn with the same
> energy interval (for example 2.3E-2 to 2.3E-2). I don't know why.
>
> I want to calculate de dose before and after the shielding and I'm
> trying to sum all the points in each interval of energy but I find
> that after the first layer I have the same dose that after the
> shielding element. This is a good way for obtain the dose?
>
> I add some folders
>
> _2 nd problem: k alpha line of copper
> _
> In the same configuration (changing the first layer for copper) I
> send a proton beam on a copper target in order to see the k alpha
> line (8.02 KeV). I am able to see the k alpha line with a proton
> energy more than 30 MeV. Under this energy it is impossible to see
> the k alpha line.
> The card I am using to see the k alpha line are the following:
> EMF, EMFFLUO, EMFCUT prod, EMFCUT transport.
>
> I would like to know why I can not see them with lower energy and
> which card should I add to see k alpha with a proton beam less
> than 30 MeV and if possible for 5 MeV proton beam, on the other
> hand, if I use an electron beam with a hundred of KeV, in this
> case I can see the K alpha without problems.
>
> Kind Regards
>
>
>
> --
> D. Javier Lozano Díaz
> Técnico de apoyo en Radioprotección
> Centro de láseres Pulsados Ultracortos (CLPU)
> Calle Adaja nº8 C.P. 37185 Villamayor, Salamanca.
> Edificio M5, Parque Científico USAL.
> *Tel:* 923 338 121 *Ext:* 26
> *E-mail:* jlozano_at_clpu.es <mailto:jlozano_at_clpu.es>
> www.clpu.es <http://www.clpu.es>
>
>
>
--
========================================================================
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 Tue Jul 04 2017 - 16:03:52 CEST