Re: [fluka-discuss]: Energy deposition attribution

From: Alberto Fasso' <>
Date: Mon, 25 May 2015 02:37:07 -0700 (PDT)

I guess that the missing energy deposition is due to electrons. You are using
the default HADROTHE, which has a threshold for delta ray production of
100 keV. Therefore, most of the energy is deposited by delta rays.
You can easily check this in two ways:
1) use AUXSCORE to add deposition by electrons
2) use command DELTARAY to set the threshold to infinity (i.e., an energy
higher than that of the beam). With delta ray suppressed, the sum of all curves
should coincide with the total


On Mon, 25 May 2015, Staffan Engdahl wrote:

> Dear FLUKA experts,
> I have a query regarding how energy deposition is attributed to different
> particles in FLUKA.
> I attach a plot of laterally integrated energy deposition (IDD) of a parallel
> 450MeV/u carbon beam on a cylindrical water phantom. I have used USRBIN to
> score the energy deposition in a cylindrical mesh. I used AUXSCORE to
> discriminate between particle species and one USRBIN without particle
> discrimination (blue curve). After summation of the energy depositions from
> all scored particles I end up with the black curve. This means that I get a
> rather large difference between total energy scored and the summed energy from
> the major beam constituents. (I did not include the 12C in the summed dose)
> One would expect some disagreement between the curves due to some minor
> secondaries from inelastic interactions (and recoils?) but not to this extent?
> Question: To which particle species could the dose difference between the blue
> and the black curve be attributed?
> See my attached input card for more details on the simulation.
> Thanks in advance!
> Best Regards,
> Staffan Engdahl

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Received on Mon May 25 2015 - 13:14:31 CEST

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