Re: [fluka-discuss]:

From: <>
Date: Thu, 23 Oct 2014 12:27:44 -0700 (PDT)

Dear Anton,

Your inp specifies a 10 GeV proton flood source in a direction 'from outside
in', intercepting a 1500 cm-think 1e4 cm-radius disc of air, of density .1205e-2
g/cm^3. If this is indeed the application you intend to simulate, I don't
understand where is the problem. Why not, why would you not expect particles all
over the place? Do you expect thin air to be able to stop 10 GeV protons?

If 10 GeV protons have a range of 100 g/cm^2 as you quote, that would be
100/.1205e-2 = 82988 cm, which is 4 times greater than the diameter of your disc
of air and 55 times greater than the thickness of your disc of air.

10 GeV protons in dry, near sea-level air have a range of 505e4 g/cm^2, which is
orders of magnitude greater than the range you gave.
505e4/.1205e-2 = 4190871369 cm, which is 209543 times the diameter and 2793914
times the thickness of your disc of air.

:) mary

> On 23 October 2014 at 05:33 Anton Artamonov <> wrote:
> Dear FLUKA users and developers
> I explore cascade in the atmosphere.
> For any energies, for isotropic proton and alpha beams I had strange results
> : At the deep depth of the atmosphere I found secondary particles even
> primaries particles! Of Course proton with small energy cannot penetrate
> through more then 100 g/cm^2. I think it is my mistake maybe in geometry.
> In attachments my input file.
> Please help me.
Received on Thu Oct 23 2014 - 22:49:12 CEST

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