Re: Two sources

From: Anna Ferrari <>
Date: Tue, 02 Oct 2012 04:58:07 +0200

Dear Zafar Yasin,

you received already a suggestion to solve your problem (you have to use the
external user routine source.f), I would like to add just a couple of
First: you can well describe with FLUKA the two kind of source you need.
In source.f you will sample the energy distributions of the primaries and you
will model the cylindrical source (coordinates of the primaries, direction
cosines). In the chapter 13.2.19 of the manual you find an extensive
In principle I think you can also sample different kind of primaries in the
same run, obviously choosing the proper weight in extracting photons or
neutrons (somebody can correct me if I'm wrong). The more frequent approach
(which in my opinion has many advantages)is to do two different simulations,
one for photons and one for neutrons, then to analyze the two separate
contributions and finally to add the quantities you are interested to.

You will build the FLUKA executable by linking the external source user
Last: the user-dependent source routine is activated by the card SOURCE in the
input fle. There is also the possibility to pass to the source routine several
user parameters (see the manual for that).


Am Thu, 20 Sep 2012 04:34:56 +0000 schrieb Zafar Yasin <>:
> Dear FLUKA users and experts,
> I want to model a cylinderical source that emits two types of radiations
> (photons and neutrons) and both have different energy spectra.
> The neutrons have thermal spectra from few KeV to 10 MeV range.
> Same type of spectra is of gamma rays.
> Is it possible to use these type of sources in FLUKA?
> Thank you in advance.
> Best regards,
> Zafar Yasin
Received on Tue Oct 02 2012 - 09:24:26 CEST

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