Re: [fluka-discuss]: Number of ionizations in a region

From: Vittorio Boccone <>
Date: Sat, 16 Nov 2013 20:54:07 +0000

Dear Angelo,
 the unit of what you score with USRBIN depend on your what(1) and what(2)
of the USRBIN card. Supposing that you have 10<=what(1)<=18 you will score
the tracklenght density of the particle(s) defined in what (2).

The mesh of the USRBIN defines the volume on which the value is calculated.

If you want to do it by region the best way is to normalize to the volume
in the post-processing of the simulation.

There’s a way to pass region's volumes to FLUKA but they are only used to
normalize the energy in region if/where/when the SCORE command is used.

You can pass volume also to USRTRACK and USRCOLL in order to have normalized results.

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On 15 Nov 2013, at 20:39, Angelo Infantino <<>> wrote:
Little correction to my previous mail. Correct me if I am wrong.
The USRBIN calcualtes the particle tracks density right? So it needs the volume to get particles/cm2/primary.
So the question is what volume is used? (not what surface!)
What about the region binning?
Thank you
Subject: RE: [fluka-discuss]: Number of ionizations in a region
Date: Fri, 15 Nov 2013 18:45:33 +0100
Dear Nikhil,
When I score particles with USRBIN I obtain a fluence/primary. For example, if I filter with AUXSCORE only the ELECTRONS, with a XYZ mesh, I obtain the #e/cm2/primary. Correct?
But what is the surface that the score use to normalize the result? The surface of the bin that I created?
And what about the region scoring? I get the #e/primary in the whole region?
Last question: If I score charged particle, i.e. electrons, how I can say that these electrons not came also from interactions of photons (photoelectric effect, compton ecc) or other particles?
Thank you.
Date: Fri, 15 Nov 2013 10:33:46 +0100
Subject: Re: [fluka-discuss]: Number of ionizations in a region
Dear Angelo,
you can try scoring the charged particles and then normalize to the proton current. For example, one can score different kinds of charged particles using USRBIN.
On Thu, Nov 14, 2013 at 7:38 PM, Angelo Infantino <<>> wrote:
Dear Fluka experts,
I'm trying to calculate the number of ionizations given by a proton beam in a region. At the end I want to get the current generated in uA (only by the primary protons).
To figure out how to get this number I built a very simple geometry: A proton beam (13 MeV pencil beam with no spread in energy and direction) on a cylindrical target of copper, thick enough to stop completly the beam. The target is surrounded by a region of vacuum and blackhole. My goal is to score the current (in uA) generated by the primary particles in the copper target.
Is it possible to do with the standard score of fluka?
Thank you in advance!
Received on Sat Nov 16 2013 - 22:56:01 CET

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