as it sometimes happen, some answers just came along after some time while doing many testing,
- in this particular case, there is no difference if default is precision or em-casc, I just was surprised that even with em-casc I can see anti neutrino generation in .out list;
- transport threshold depends on the accuracy needed, I think <100 kEV electron penetration in the body tissue is below 0,1 mm so no practical need to lower it,
Rgds
Alex
________________________________
From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> on behalf of 委v鋱k Aleksandras <aleksandras.sevcik_at_ktu.edu>
Sent: Monday, March 20, 2017 9:35:51 PM
To: paola.sala_at_mi.infn.it
Cc: Alfredo Ferrari
Subject: Re: [fluka-discuss]: isotope source anisotropy
Hi Paola,
Thanks :) I forgot to mention that I'm modeling the encapsulated source - I did not expect that the encapsulation will have such a big effect on the dose homogeneity. Yet it seems I was very wrong.
I run the simulation with and without encapsulation, see attached picture. Poor statistics, but fits for an illustration.
It seems that with the encapsulation I'm getting the same similar shapes the one can find in the literature.
I found one paper with measured dose in the phantom, see attached picture (source :Hurley, C., et al. "High-resolution gel dosimetry of a HDR brachytherapy source using normoxic polymer gel dosimeters: preliminary study." )
By the way, I'm running the simulation with defaults PRECISIO, which has 100 keV particle transport threshold - so for any generated electron <100 keV the dose is scored immediately at that point ? Would lower threshold, let's say, 50 keV, be more accurate, if I can say so ? Wouldn't be defaults EM-CASC with lower particle threshold be the most optimal setup regarding time and accuracy of the dose scoring in the water/tissue for this specific radionuclide (Ir192)?
The insights would be much appreciated,
Alex
________________________________
From: Paola Sala <paola.sala_at_mi.infn.it>
Sent: Monday, March 20, 2017 9:10:18 AM
To: 委v鋱k Aleksandras
Cc: Alfredo Ferrari
Subject: Re: [fluka-discuss]: isotope source anisotropy
Dear Aleksandras
I tried to reproduce your simulation, but I get a completely symmetric
plot, no apples.Could you, please, send me the input file, and the details
of the plotting axis/limits ?
Thanks
Paola
> Dear experts,
>
>
> I am comparing my modelling results of Ir192 isotope source in the water
> and would expect slightly different shape instead of "apple" I got. See
> the picture with included result and comparison pictures.
>
>
> Source Ir192, cylindrical 3,5x0,6 mm, water cube 20x20x20 cm, rad-decay
> semi-analogue, no cuts, usrbin x-y-z scoring 20x20x20 containing
> 150x150x150 bins.
>
>
> Any comments much appreciated,
>
>
> Regards
>
> Aleksandras
>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Wed Mar 22 2017 - 11:08:57 CET