Hello Sir, this is my input file. Like I said, for other energies (such as
4MeV, 8MeV and even 15MeV) I got values in tandem with XCOM values at those
energies. I have attached the input file sir. Right there, the EMFCUT card
is highlighted showing am error. Could you please help me with the preset
for this problem?
The energy I am interested in is 10keV (as a sample of lower energies)
I will be very grateful Sir.
warm regards
Ocheinstein(Nigeria)
On Aug 26, 2020 10:46 AM, "Paola Sala" <paola.sala_at_mi.infn.it> wrote:
> maybe some mistake in the cards?
> Please, look in the output file, as I wrote to the other user
> Paola
>
> > I did that but the results came out null again
> >
> > On Aug 26, 2020 10:15 AM, "Paola Sala" <paola.sala_at_mi.infn.it> wrote:
> >
> >> Hello
> >> it depends on what you need!
> >> PRECISION sets the threshold for electrons at 100 keV, the threshold for
> >> photons at 33 keV. If you need lower energies, then you have to add
> >> EMFCUT.
> >> Paola
> >> > Thanks for this very useful response. If I set the DEFAULTS as
> >> PRECISION
> >> > Do I need to add the EMFCUT CARD? Since you said it sets the threshold
> >> > values by default for electrons and photons.
> >> >
> >> > Thanks again
> >> > Ocheinstein(Nigeria)
> >> >
> >> > On Aug 24, 2020 11:01 AM, "Paola Sala" <paola.sala_at_mi.infn.it> wrote:
> >> >
> >> >> Hello
> >> >> The input needs to be better tailored to your problem:
> >> >> The input does not include any DEFAULTS or EMF-CUT card. As a
> >> >> consequence,
> >> >> the production and transport thresholds are set according to the
> >> default
> >> >> "DEFAULT":, which means NEW-DEFA, which sets the photon transport
> >> >> threshold to 300 keV. No photon below that energy will be
> >> transported.
> >> >> The threshold settings can be chacked in the output file, the FLUKA
> >> >> output, not the flair one. The FFLUKA output is obtained for each
> >> cycle
> >> >> and has the cycle number in it. In your case mu_original001.out for
> >> the
> >> >> first cycle. There you'll see
> >> >>
> >> >> PMMA
> >> >> Rho = 1.19000 g/cm**3 Rlc= 34.0748 cm
> >> >> Ae = 1.51100 MeV Ue = 5061.25 MeV
> >> >> Ap = 0.333333 MeV Up = 5060.74 MeV
> >> >> Ae and Ap being the thresholds for electrons and photrons, in MeV,
> >> >> total
> >> >> energy.
> >> >>
> >> >> You can either include a DEFAULT card with SDUM=PRECISIO, and/or add
> >> two
> >> >> EMF-CUT cards for production and transport of electrons and photons.
> >> I
> >> >> would suggest to add in any case a DEFAULT=PRECISION, because it
> >> >> activates
> >> >> precision effects important at low energies. With it, the electron
> >> >> threshold ids set to 100 keV, and the phorton one to 33 keV.
> >> >> Regards
> >> >> Paola
> >> >> > Dear Fluka Experts,
> >> >> >
> >> >> > I am using USRBDX to obtain the mass attenuation coefficient for
> >> some
> >> >> > polymers like PMMA , using photons with energies from 50 keV to 150
> >> >> keV.
> >> >> > Before using it in the geometry that I am building, I wanted to
> >> test
> >> >> the
> >> >> > method in a simpler input. I am using the input provided by user
> >> >> Andrea
> >> >> > Fontana from this discussion
> >> >> > http://www.fluka.org/web_archive/earchive/new-fluka-
> >> discuss/11329.html
> >> >> > (mu_orignial.inp).
> >> >> >
> >> >> > It works well for energies above 400 keV, with the resultant mass
> >> >> > attenuation coefficient value being very close to NIST, but below
> >> that
> >> >> it
> >> >> > detects 0 particles on the estimator that goes from the sample to
> >> the
> >> >> > vacuum around (24 BIN), as it shows in the file
> >> >> mu_original_24_sum.lis,
> >> >> > with any different thickness of material that I try .
> >> >> > By Lambert-Beer Law, and using NIST value of mass attenuation
> >> >> coefficient
> >> >> > for PMMA (pho= 1.19 g/cm³) 1.456E-01 cm²/g, with 2.5000002E-03
> >> >> part/cm²/pr
> >> >> > of incident intensity, thickness of 0.1 cm,
> >> >> > I should be detecting around 2.10E-03 part/cm²/pr of transmitted
> >> >> > intensity
> >> >> > for 150 keV, but it detects 0.
> >> >> >
> >> >> > There are no error messages in the compilation. I don't understand
> >> why
> >> >> > this
> >> >> > is happening, can you please help with this issue?
> >> >> >
> >> >> > Regards,
> >> >> > Samuel
> >> >> >
> >> >>
> >> >>
> >> >> Paola Sala
> >> >> INFN Milano
> >> >> tel. Milano +39-0250317374
> >> >> tel. CERN +41-227679148
> >> >>
> >> >> ____________________________________________________________
> >> ______________
> >> >> You can manage unsubscription from this mailing list at
> >> >> https://www.fluka.org/fluka.php?id=acc_info
> >> >>
> >> >>
> >> >
> >>
> >>
> >> Paola Sala
> >> INFN Milano
> >> tel. Milano +39-0250317374
> >> tel. CERN +41-227679148
> >>
> >>
> >
>
>
> Paola Sala
> INFN Milano
> tel. Milano +39-0250317374
> tel. CERN +41-227679148
>
>
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- application/octet-stream attachment: m_u.inp
Received on Wed Aug 26 2020 - 22:14:22 CEST