Thank you for the fast response!
Yes, that was also my initial guess and I have run a simulation where I discard all electrons using the DISCARD card (see the attached input card) and it is obvious that the "missing" dose comes from electrons.
As you mention, most energy is deposited by delta rays due to the low production threshold.
Does this mean that the dose attributed to a specific particle (defined in the AUXSCORE) only comes from the energy lost in the CSDA? Meaning that the dose from delta rays produced in inelastic interactions with the same specific particle is not attributed to that particle?
Best regards,
Staffan Engdahl
-----Original Message-----
From: Alberto Fasso' [mailto:fasso_at_slac.stanford.edu]
Sent: den 25 maj 2015 11:37
To: fluka-discuss_at_fluka.org
Cc: Staffan Engdahl
Subject: Re: [fluka-discuss]: Energy deposition attribution
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
Alberto
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 - 16:56:56 CEST