Dear Anton,
You sent .flair but not .inp. Without .inp I don't know what's in your .inp, but
probably there is no need. You can resolve the issue yourself by the same recipe
I showed:
1. find a reliable database for table lookup;
2. lookup the range or mean free path for your particle type and energy;
3. assuming the range or mfp is given in mass per cm^2, divide this value with
the density of your material, you'll get the range in cm;
4. compare this distance with the depth traversed by your particle.
I bet you'll find that FLUKA reports primaries only where the above suggests
that there should be primaries present.
I suggest not to worry about FLUKA technicalities or geometry at this point.
Best to sort out basic radiation physics first.
:) mary
> On 24 October 2014 at 02:42 Anton Artamonov <Anton.Artamonov_at_oulu.fi> wrote:
>
>
> 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
>
>
>
> BR,
>
> Anton
>
>
> ---------------------------------------------
> From: me_at_marychin.org <me_at_marychin.org>
> Sent: Thursday, October 23, 2014 10:27 PM
> To: Anton Artamonov; fluka-discuss_at_fluka.org
> 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.
>
> From
> http://physics.nist.gov/cgi-bin/Star/ap_table.pl
> 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 <Anton.Artamonov_at_oulu.fi>
> > > 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 - 21:32:28 CEST