Hello Joachim,
thanks for your answer. So i detect the neutron spektra via USRBDX
Part:Neutron .
And now i use the LAM_BIAS Card with SDUM = GDECAY, and the settings
seen in the picture below. Is this the right way for my simulation?
Based on your advice to set the binning structure manually and to use
logaithmic bins for neutrons spectra scoring, how can I realize it in
the simulation?
Thanks for your answer and help.
Konstantin
Am 16.12.2017 um 12:23 schrieb Joachim Vollaire:
>
> Hello Konstantin
>
> A few things looking at your input. As you are using an electron beam
> and you want to see neutrons from photonuclear reactions it is
> recommended to add a LAM-BIAS card to increase the probability of
> nuclear reactions (FLUKA will correct the weight of generated
> particles accordingly). See the corresponding part of the manual.
>
> Concerning the scoring, USRBDX is a surface crossing estimator (shared
> surface between adjacent regions), so it does not make sense to use
> the generalized particle ENERGY which corresponds to energy deposited
> along tracks not at surface crossing. The filtering with AMB74 does
> not make sense either as this is usually used for dose equivalent
> scoring (generalized particle DOSE-EQ) to select the desired dose
> equivalent conversion factor (folded with the fluence from track
> length estimators -> USRTRACK/USRBIN…).
>
> So the first card is the correct approach. Note that the binning
> structure below 20 MeV will not be linear as you request but it will
> correspond to the boundaries of the 260 energy groups used for neutron
> transport below 20 MeV. It is suggested to manually set the binning
> structure (upper limit in that case) and use logarithmic bins for
> neutrons spectra scoring.
>
> Hoping this help
>
> Greetings
>
> Joachim
>
> *From:*owner-fluka-discuss_at_mi.infn.it
> [mailto:owner-fluka-discuss_at_mi.infn.it] *On Behalf Of *Konstantin Rönsch
> *Sent:* 15 December 2017 20:33
> *To:* fluka-discuss_at_fluka.org
> *Subject:* [fluka-discuss]: USRBDX Neutron-Energy
>
> Dear Fluka experts,
>
> with Fluka i simulate an elektron beam on a tungsten target and i want
> to detect the energy spectrum of the neutron radiation between the
> materials tungsten and air.
>
> I use the Card USRBDX to detect the spectrum, but i am not shure which
> settings are correct for my example. I simulate USRBDX for Neutrons
> and in an other card USRBDX with energy and a AUXSCORE card to filter
> the neutron part of the energy. So which way is the correct, or what
> are the differents, because the results are not exactly the same.
>
> Thanks for help
>
> Konstantin
>
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Received on Sat Dec 16 2017 - 14:14:55 CET