Date: Wed, 14 Feb 2018 11:53:55 -0300
I am not Fluka expert, but regarding the problem you pointed out, photon
flux might not be the same in the different situations your are studying.
Particularly, if you tally photon flux in the near of "entrance" surface,
you may count both primary and scattered photons (it may depend on the
FLUKA tally you used, "photon" or "beampart").
changing material shall vary scattering (backscattering, for the purposes
of your problem, mainly) and therefore some differences could be present.
If "beampart" tally does not account (please check, I am not FLUKA expert)
any kind of scattered particles (i.e. if you can be sure that
inelastic/elastic scattered primary are not accounted by beampart tally),
then you may compare this tally among your different setups. Otherwise, if
"photons" in your tally include all types of photons, you should notice
some differences at the entrance due to backscattering.
Best regards,
2018-02-14 10:21 GMT-03:00 Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>:
> back scattering from the material maybe?
>
> Cheers
> Vasilis
>
>
> ------------------------------
> *From:* owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it]
> on behalf of Beatrice Pomaro [beatrice.pomaro_at_dicea.unipd.it]
> *Sent:* Wednesday, February 14, 2018 11:36
> *To:* fluka-discuss
> *Subject:* [fluka-discuss]: Attenuation coefficient for photons in a
> material
>
>
> Dear Fluka experts,
> I am simulating an irradiation experiment with a Co60 source of samples
> made by a different material at the same distance (20cm) from the source. I
> have plotted the photon flux against the sample thickness, 10cm (here
> below) and I find curiously that the flux at the face in front of the
> source (_at_20cm) is never the same, in particular it is much different when
> the propagation is in air (no sample).
> Can you, please, explain me how I can fix this aspect?
> Thank you, bests
> Beatrice
>
>
>
> --
> **************************************************
> Ing. Beatrice Pomaro
>
> Universita' degli Studi di Padova
> Dipartimento di Ingegneria Civile, Edile e Ambientale
> Via F. Marzolo, 9 - 35131 Padova (Italy
> <https://maps.google.com/?q=Via+F.+Marzolo,+9+-+35131+Padova+(Italy&entry=gmail&source=g>
> )
> tel.: +39 049 8275592
> e-mail: beatrice.pomaro_at_dicea.unipd.it
>
>
>
--
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