Re: [fluka-discuss]: Modeling painted surface

From: Paola Sala <paola.sala_at_mi.infn.it>
Date: Mon, 7 Jan 2019 17:57:52 +0100

Dear Nima Gal-Eh,
In principle the procedure you describe should work. Could you, please,
send the input file and the roughness routine so that I can check if
something is not working as supposed?
Thank you
Paola

> Dear Fluka experts,
>
> I am trying to precisely model a painted surface of a scintillator. It
> should have two well known properties: (1) To behave as a diffuse
> reflector of optical photons, and (2) To absorb a specific amount of
> optical photon intensity and reflect the rest, which is known as paint
> reflectivity.
>
> The diffuse reflection of light can be simply undertaken with
> user-routine frghns.f, whilst, the paint reflectivity may be either
> introduced with user-routine rflctv.f or through the definition of rough
> surface (i.e., the scintillator boundary) and an absorber (i.e., metal
> housing).
>
> My question is “Why does Fluka give the wrong answer when the rough
> surface is the scintillator-metal boundary?" I suspect that the
> definition of metal reflectivity in the OPT-PROP card does not work
> properly in this case.
>
> Could you please let me know if there is any other alternative for
> painted surface modeling?
>
> Thank you very much and looking forward to hearing from you soon.
>
> Sincerely,
> Nima Ghal-Eh.
>
>
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Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148

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Received on Mon Jan 07 2019 - 19:04:29 CET

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