RE: [fluka-discuss]: customized beam shape

From: Ševčik Aleksandras <>
Date: Thu, 25 Jul 2019 13:29:38 +0000

Hei Cesc!

Thank your for your input, I have actually checked these articles as well, however, with no particular useful information for my case presented.
Anyway trial and error is the option then, thanks anyway,

By the way, maybe you have an experience how to modify source.f to allow using divergence parameter for the rectangular shaped beam?


-----Original Message-----
From: Francesc Salvat-Pujol <>
Sent: Thursday, July 25, 2019 11:00
To: Ševčik Aleksandras <>
Subject: Re: [fluka-discuss]: customized beam shape

Hey Alex,

I have no particularly smart suggestion (inverse problems are nasty).

In the meantime, you may have already seen this reference:

In pags 2 and 3 they give several explicit details about the specs and settings of the unit in their particular study.

Likewise, this ref

gives more specs of the machine (and cites further refs with potentially more useful info).

Unless documented elsewhere, try to reach out to whoever produced the figure you're trying to match to see exactly what they did. They may deliver further essential details.



On Thu, Jul 25 2019, at 06:24 +0000, Ševčik Aleksandras wrote:
>Dear experts and other Fluka users,
>Looking for an advice in the specific case of mine - maybe someone will be able to give some insights and thoughts as I am running out of time and options.
>I am trying to do some kind of "reverse engineering " - model the beam / geometry just from the experimental results with gafchromic films/doses. The only info I have is the machine spectrum, the machine model - Gulmay D3225, and the isodoses, see attached. If I am using just simple flat annular beam as in the default BEAM options, the values are more less ok, but the isolines of the doses are not flattened much, especially in the far end, they are round. My guess that Gulmay is using some kind of flattening filter, but I have zero documentation about this machine and I am unable to find anything more in the web. Blind guesses, i.e. modelling cone shaped Al2O3 filter before the initial beam does flatten the beam somehow, but still the shape is not like in the real experiment. Maybe someone has any knowledge about this machine, or just have some awesome thoughts/insights what else I could use for such, let's say, unusual task?

Francesc Salvat Pujol
CH-1211 Geneva 23
Tel: +41 22 76 64011
Fax: +41 22 76 69474
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Received on Thu Jul 25 2019 - 16:48:29 CEST

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