Re: [fluka-discuss]: Spatial distribution of neutron production and proton termination

From: Answers <answers_at_pcfluka.mi.infn.it>
Date: Wed, 22 Jul 2020 13:34:39 +0200 (CEST)

Dear Qi,
regarding the yield of produced neutrons,
I suggest you to use the USRBIN card instead of USRYIELD.
USRBIN allows you scoring fluence of a certain type of particle
(in your case neutron) in a 3D grid.
You can then integrate (or set the number of bins equal to 1)
along X and Y, or only along Y, to get the neutron fluence along Z
or information on the spatial distribution of neutrons in the XZY plane.
Instead, I would suggest to use USRYIELD for angular distribution studies.

Concerning the protons, can you please explain me better
what you mean with proton termination?
If you refer to the point where the protons stop,
a depth dose profile may be the solution to your question:
you can score deposited dose as a function of depth (z axis),
and from the Bragg peak position you can extrapolate the proton range.

I hope this answers your questions.

Best regards,
Giulia


On Wed, 15 Jul 2020, Ding, Qi wrote:

>
> Dear Fluka experts,
>
>
> In my simulation, the BEAM source is a homogeneous proton beam and it impinges target along the z-axis.
> as the title says, Id like to observe the spatial distribution of emerging neutrons and proton termination.
> I read the manual and forum, it seems that I need USRYIELD. But it does not apply to a region volume, rather to a boundary
> surface between two regions.
> I have the following questions:
>
> *
>
> I would like to know the number of neutron production and proton termination as a function of Z coordinate (depth in
> target).
>
> *
>
> the other one is I want to get the spatial distribution of neutron production and proton termination on the XZP
> plane(parallel to proton impinging target direction).
> Could you please tell me there is any way to record these informaiton and how to do it?
>
> Thanks in advance.
>
>
> Best regards,
>
>
> Qi Ding
>
>
>
>
>
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Received on Wed Jul 22 2020 - 14:56:43 CEST

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