Dear Francesco, Mauro,
Thank you very much, I thought that default thresholds are the minimal possible values.. Thanks again!
Rgds
Alex
-----Original Message-----
From: Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
Sent: Thursday, 7 February, 2019 01:05
To: Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu>
Cc: fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: RE: USRBDX zeroes below 340kev photon beam
Hi Alex,
as Mauro suggested, 33 keV (333 keV) is just the photon transport threshold applied by PRECISIOn (NEW-DEFA) DEFAULTS. You can lower it by means of EMFCUT, down to 100 eV for secondary photons (for a photon beam the mimimum recommended energy is about 1 keV, see the manual).
Best
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. +41 22 7678962
On Wed, 6 Feb 2019, Ševčik Aleksandras wrote:
>
> In addition, as alternative, I used USRBIN Beampart in 1x1x2 mesh to
> calculate the attenuation coefficient as well. In this option I the
> minimal energy which still gives the results was 34 keV. If smaller,
> like 33 keV, gives me zeroes even with 29x1E7 primaries. I tried
> single scattering option, but no changes. However, in the manual I
> read that ~10kev of primary photons still should work, so I guess it’s my mistake which I cannot see?.
>
>
>
> Regards
>
> Alex
>
>
>
> From: Ševčik Aleksandras
> Sent: Wednesday, 6 February, 2019 21:24
> To: fluka-discuss_at_fluka.org
> Subject: USRBDX zeroes below 340kev photon beam
>
>
>
> Hello,
>
>
>
> I was using usrbdx to score the current for linear mass attenuation
> calculation. The values were nicely matched against NIST tables, until
> I reached specifically 0.33 MeV beam value, and despite any change of
> parameter: a thickness, no of primaries, even a material itself – I
> get zeroes in output usrbdx sum.lis file no matter what I do. Yet 0.34
> MeV still gives a result. What mistake here I am making? *.inp
> attached,
>
>
>
> Regards
>
> Alex
>
>
>
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Received on Thu Feb 07 2019 - 01:04:27 CET