Alfredo,
Thank you so much for your quick answer.
Forcing single scattering with MULSOPT option seems to give very good
results, even if the boundaries are very narrow.
Ciao,
Jean-Emmanuel
-- _______________________________________________ Jean-Emmanuel Groetz Laboratoire Chrono-Environnement UMR CNRS 6249 Chimie-Physique & Rayonnements 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 _______________________________________________ Le mardi 11 décembre 2012 à 16:18 +0100, Alfredo Ferrari a écrit : > Dear Jean-Emmanuel > > surely the boundaries between the shells are disturbing the correct > elctron propagation if the shells are very narrow. One obvious > solution is to force single scattering everywhere with the MULSOPT > option, or (it should be enough) to force single scattering every time > the conditions for multiple scattering are not met > (eg MULSOPT with what(4)=1, what(5)=1, what(6)=1, or 2000 for single > scattering everywhere, sdum=GLOBEMF) > > In general one should avoid to introduce fictitiouos boundaries > particularly if they are very close one to another. > > However the lack of a spherical user binning makes it hard to do > otherwise... > > Ciao > Alfredo > > > > +----------------------------------------------------------------------+ > | Alfredo Ferrari || Tel.: +41.22.76.76119 | > | CERN-EN/STI || Fax.: +41.22.76.69474 | > | 1211 Geneva 23 || e-mail: Alfredo.Ferrari_at_cern.ch | > | Switzerland || | > +----------------------------------------------------------------------+ > > On Tue, 11 Dec 2012, Jean-Emmanuel Groetz wrote: > > > Dear Fluka experts, > > > > I would like to calculate the dose point kernel (DPK) around an > > isotropic electron point source in concentric water shells. We have > > chosen four energies: 10, 30, 50 and 100 keV. Radial binning is quite > > small, ie 1/120 of the RCSDA (continuous slowing down approximation > > range). > > Results at 50 and 100 keV seem to be good, compared to others codes, but > > at 10 and 30 keV, large discrepancies can be observed. Due to the very > > small thickness of the concentric shells of water, I am wondering if > > some options like MULSOPT or STEPSIZE must be activated or not. > > This kind of problem is most certainly addressed in the paper in Medical > > Physics (2011) with fluka authors, but I could not get it in due time. > > > > Thank you in advance for your help. > > Jean-Emmanuel > > > > -- > > _______________________________________________ > > Jean-Emmanuel Groetz > > Laboratoire Chrono-Environnement UMR CNRS 6249 > > Chimie-Physique & Rayonnements > > Universit?? de Franche-Comt?? > > 16 route de Gray > > 25030 Besan??on Cedex > > France > > > > mailto : jegroetz_at_univ-fcomte.fr > > tel : +33 (0) 3 81 66 65 07 > > fax : +33 (0) 3 81 66 65 22 > > _______________________________________________ > > > > > > > >Received on Tue Dec 11 2012 - 19:10:58 CET
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