Dear Dirk,
Although I am not a FLUKA expert, nor Geant4, I may suggest, as
Jean-Emmanuel did, that this specific task you are interested in, could be
accurately handled with PENELOPE code, which includes very nice inner shell
ionization information, among other issues for X-ray production.
Regards,
Il giorno mar 3 mar 2020 alle ore 15:26 Bartkoski,Dirk Alan <
DABartkoski_at_mdanderson.org> ha scritto:
> Thank you for the recommendation. Are you familiar how Geant4 compares to
> FLUKA in this regard?
>
> -----Original Message-----
> From: Jean-Emmanuel Groetz [mailto:jegroetz_at_univ-fcomte.fr]
> Sent: Monday, February 10, 2020 2:50 AM
> To: Bartkoski,Dirk Alan <DABartkoski_at_mdanderson.org>
> Subject: [EXT] Re: [fluka-discuss]: Tungsten Characteristic X-Ray
> Discrepancy and Underestimation
>
> WARNING: This email originated from outside of MD Anderson. Please
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> Personal message
>
> Dirk,
>
> In my opinion, if you want to use a generalist code, you should use
> Penelope 2014 (2018 version should be available soon), which has a very
> good treatment of relaxation processes and also electron impact ionization.
> This is the most accurate code for X-ray fluorescence (K and L lines)
> compared to FLUKA or MCNP.
>
> Hope this helps.
> Jean-Emmanuel
> --
> _______________________________________________
> Jean-Emmanuel Groetz
> Laboratoire Chrono-Environnement UMR CNRS 6249 Université de Franche-Comté
> 16 route de Gray
> 25030 Besançon Cedex
> France
>
> mailto : jegroetz_at_univ-fcomte.fr
> tel : +33 (0) 3 81 66 65 07
> fax : +33 (0) 3 81 66 65 22
> http://chrono-environnement.univ-fcomte.fr/spip.php?article1537
> _______________________________________________
>
>
>
>
> Le vendredi 07 février 2020 à 19:51 +0000, Bartkoski,Dirk Alan a écrit :
> > I have a simple 120 keV electron beam incident on a 50 um thick
> > tungsten target of which I am measuring the energy spectrum of the
> > forward scattering photons with an energy resolution of 0.1 keV. I
> > expect to see a typical partial-transmission target spectrum with
> > characteristic x-rays for Ka2 of 57.982 keV (NIST) in the 57.9-58.0
> > keV bin and Ka1 of 59.319 keV (NIST) in the 59.3-59.4 keV bin.
> > However, I have peaks in the 58.1-58.2 keV bin and the 59.4-59.5 keV
> > bin.
> >
> > Is this discrepancy to be expected?
> >
> > Secondly, upon researching the answer, I came across a few threads
> > dating back to 2012 to as recent as 2019:
> >
> > http://www.fluka.org/web_archive/earchive/new-fluka-discuss/5107.html
> > http://www.fluka.org/web_archive/earchive/new-fluka-discuss/8498.html
> >
> http://pcfluka.mi.infn.it/web_archive/earchive/new-fluka-discuss/13977.html
> >
> > that indicate that FLUKA does not include characteristic x-rays from
> > direct electron impact ionization events and thereby underestimates
> > characteristic x-ray production. I saw nothing about this in the
> > FLUKA2020 release notes. Is there a plan to add this additional
> > characteristic x-ray contribution in the near future
> >
> > _____________________________________________________________________
> > __________
> > Dirk A. Bartkoski, Ph.D.
> > Research Scientist | Division of Radiation Oncology
> >
> > T. Boone Pickens Tower (FCT8.5007)
> > 1515 Holcombe Blvd.
> > Unit 1420
> > Houston, TX 77030
> > (713)794-5026
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Received on Tue Mar 03 2020 - 21:25:57 CET