RE: [fluka-discuss]:

From: Anton Artamonov <>
Date: Fri, 24 Oct 2014 09:42:22 +0000

Dear Mary
You are right.

Many thanks!!!
I chose incorrectly example
I would like to show more correctly my problem
I changed a little bit my input file
I took water. And now I saw primary particles on depth 1500 g/cm^2
I think it's my mistake but I don't know where is mistake.
In attachment you can find new input file for water



From: <>
Sent: Thursday, October 23, 2014 10:27 PM
To: Anton Artamonov;
Subject: Re: [fluka-discuss]:

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 Fri Oct 24 2014 - 13:11:51 CEST

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