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Forum: Geometry
Re: Question gap between voxels (sylvia studeny)
Date: 23 Aug, 2005
From: Vladimir IVANTCHENKO <>

On Tue, 23 Aug 2005, sylvia studeny wrote:

> *** Discussion title: Geometry
> Email replies to must include:
>   In-Reply-To: <"/geometry/432">
>   Subject: ...change this to be about your reply.
> Hi,
> I found a strange thing while running a simple parametriesed volume 
> example:
> I took novice/exampleN02 and changed the geometry into a 10cm*10cm*10cm
> box consisting of voxels of the size 2mm*2mm*5mm out of soft tissue. This
>  box I but into a mother volume (out of air). 
> I put a point source of 1MeV protons just at the surface of the box. 
> When I looked at the tracks I saw a really strange thing: the protons 
> penetradted much to deeply into the matter. 
> Apperently, I just managed to shoot them into a gap between the voxels, 
> which is filled with the mother-volume-material=air.
> Similar things happen when I take Photons or other energies.
> My question now is: Im using geant4.7.0p1 on SuSe Linux 9.1. Is this
> thing I found a mistake on my side ?(I thought a put the voxels close to
> each other, like in the examples, all is running fine,no errors) If not,
> will it be fixed in future versions of geant4? (e.g. when the new
> "Optimised navigation for voxelised phantom geometries" will be
> released)
> I hope someone can answer. Thanks, Sylvia

1) Put all you voxels inside mother box of water.
2) Check number of steps of a proton.


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