[Gate-users] Energy cuts in v4.0

[Peter Bruyndonckx]

Niklas,

I actually don't want to suppress the low energy photons and delta  
rays since I am trying to study some things for CT (X-ray  
production).  I just want to be sure about what Gate is exactly  
simulatiing, i.e. which energy cuts are really applied.

Cheers,

Peter


Date: Wed, 08 Oct 2008 14:15:40 +0200
From: "Niklas Rehfeld" <rehfeld at imnc.in2p3.fr>
Subject: Re: [Gate-users] Energy cuts in v4.0
To: gate-users at lists.healthgrid.org
Message-ID: <op.uipgceosbii9a1 at milka>
Content-Type: text/plain; format=flowed; delsp=yes; charset=utf-8

Dear Peter,

Apparently there are indeed problems (but I did not test it myself, so I
cannot comment on that).

In the following special configuration you can definitely suppress low
energy photons (but only in the phantom!):

- voxelized phantom
- fictitious tracking (see 7.3.4 in the user's guide)
- using the command "setGammaDiscardEnergy"

This tracking works however not with all processes. Since this cut is  
not
implemented in Geant4, in this special case the Geant4 output might be
misleading (i.e. not showing this cut).

Cheers,

Niklas



On Wed, 08 Oct 2008 13:37:26 +0200, Peter Bruyndonckx  
<pbruynd at vub.ac.be>
wrote:

> Dear All,
>
> Last month Guilem mentioned a problem with setting the energy (or  
> range)
> cuts on X-rays in version 3.1.2.  Has this been fixed in version 4.0 ?
> When I run version 4.0, it always seems to be set at 0 fm or 990 eV.
> This is what I see on the output :
>
> Index : 3     used in the geometry : Yes     recalculation needed : No
> Material : Lead
> Range cuts        :  gamma 0 fm     e- 10 cm     e+ 1 mm
> Energy thresholds :  gamma 990 eV     e- 437.915 MeV    e+ 1.28002 MeV
>
> The displayed energy threshold does not change when I change the  
> setting
> in the .mac file.
>
> The cuts on the electrons and positrons seem to work.  I am not sure
> about delta-rays.
>
> Anybody else has some experience with this ?
>
> Regards,
>
> Peter
>
>

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