Hello
given that your geometry is cylindically symmetric, I would suggest a
cylindrical binning.
And, I do not see the need to have more than one bin in phi. Again, the
geometry is phi-symmetric and the source is on the axis of the cylinder,
there cannot be any phi-dependence in the results except for statistical
fluctuations, and you'll gain a lot of statistics integrating over 2pi in
phi.
Then: do you want to score dose or dose-eq? I see two different quantities
in the output files.
About the difference in statistics: if you score at z=0 in both cases,
the solid angle will be different for the two cases, thus the statistics
will be different.
Regards
Paola
>
> Dear Experts,
>
> We have tried to calculate maximum surface dose rate on the surface of a
> SS cup (with center at (0,0,0) and outer radius 5.0445 cm) when the source
> is at (4.6,0,0).
>
> We tried this with Cartesian binning and R-phi-Z binning and scored
> DOSE-EQ.
>
> Please find attached the input files for 765.8 keV photon for both type of
> binnings and the results obtained (.lis fles).
>
> We would request you to comment on the correctness of the input and the
> results obtained.
>
> Can you please suggest which of the two binnings is advisable in our case
> ? Or, both can be used ?
>
> As we needed the dose rate at a point, we have reduced the volume of the
> bin to 1 mm^3 approx. - is this okay as the statistical errors seem less ?
> (We also found that when the source is at (0,0,0), the statistical errors
> seem to increase for 1 mm^3 binning detector, when compared to source at
> (4.6,0,0). We couldn't understand why. Please throw some light on this. )
>
> Kindly suggest any improvement to evaluate the dose rate at a point using
> FLUKA.
>
> Can you provide some example of using "special user defined 3D binning" in
> USRBIN ?
>
> Thanks and regards,
> Raksha Rajput.
>
>
>
>
>
>
Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148
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Received on Fri Aug 07 2020 - 18:09:35 CEST