[Gate-users] RE : emission angular distribution of a gamma source

[Panagiotis Papadimitroulas]

Dear Yannick,

I think the commands that your are looking for are the below:

instead of using the:
  /gate/source/YOUR_SOURCE/gps/angtype iso

You can use these:
/gate/source/YOURSource/gps/mintheta 0. deg
/gate/source/YOURSource/gps/maxtheta 180. deg
/gate/source/YOURSource/gps/minphi 0. deg
/gate/source/YOURSource/gps/maxphi 360. deg

So by these commands you can define exactly your angular distribution.

Best regards,
Panagiotis

##########################################
###   Panagiotis Papadimitroulas, Msc                                        
###   PhD candidate, Department of Medical Physics      
###   University of Patras                                                    
###   Greece                                                                           
###                                                                                           
###   email:        panpap_5 at hotmail.com       
###   web page: http://www.teiath.gr/stef/tio/ni/
###                       http://www.kagadis.gr

> From: Yannick.Grondin at chuv.ch
> To: venialgo at cae.cnea.gov.ar; gate-users at lists.opengatecollaboration.org
> Date: Thu, 14 Jun 2012 10:31:18 +0200
> Subject: [Gate-users] RE : emission angular distribution of a gamma source
> 
> Dear Esteban,
> 
> Thank you for your answer! But I realised that my question was not precise enough. 
> Indeed, I used GPS to define the source. My question is about the angular distribution of the emitted particles.
> Usually I guess, people use isotropic emission with this command :
> 
> /gate/source/YOUR_SOURCE/gps/angtype iso
> 
> By searching in GATE commands list, I found that it seems to be possible to have a user-defined angular distribution, by this command:
> 
> /gate/source/YOUR_SOURCE/gps/angtype user
> 
> Since I want to define an angular distribution  of the "phi" angle of the emitted particles, I used the command:
> 
> /gate/source/YOUR_SOURCE/gps/histname phi
> 
> and then I defined an histogram with these command lines :
> 
> /gate/source/YOUR_SOURCE/gps/histpoint 1.382660 0.440000 
> /gate/source/YOUR_SOURCE/gps/histpoint 1.401275 0.550000
> . . .
> . . .
> 
> where the first number represents the angle in rad, the second number, the weight. 
> These command lines are "inspired" from the link of the GPS page you gave me, but it seems to not work in GATE: I don't get any segmentation fault, but nothing happens either ..
> 
> Moreover I have another problem :  How to say that I want isotropic distribution in theta ? 
> 
> Thank you for your help,
> 
> Regards,
> 
> Yannick
> 
> 
> 
> 
> 
> ======================================
> Yannick Grondin
> Master Student in Medical Physics
> Groupe Imagerie Médicale
> Institut de Radiophysique - CHUV
> Rue du Grand-Pré 1
> 1007 Lausanne
> Switzerland
> ======================================
> ________________________________________
> De : Esteban Venialgo [venialgo at cae.cnea.gov.ar]
> Date d'envoi : mercredi, 13. juin 2012 18:34
> À : Grondin Yannick; gate-users at lists.opengatecollaboration.org
> Objet : Re: [Gate-users] emission angular distribution of a gamma source
> 
> Dear Yannick
> 
> GATE uses GPS (general particle soruce) to generate particles so you can
> use the GPS commands to simulate any sources. All the commands are
> equivalent except for the path of the commands.
> 
> you can find the GPS manual here:
> http://reat.space.qinetiq.com/gps/new_gps_sum_files/gps_sum.htm
> 
> and in GATE, the path of the commands is the next:
> 
> /gate/source/YOUR_SOURCE/gps/
> 
>   Best regards, Esteban.
> 
> 
> 
> Grondin Yannick wrote:
> > Hi,
> >
> > I'm trying to simulate a gamma source with a user-defined  emission angular distribution (histogram). It seems to be possible in GEANT4 (and the philosophy is the same as the energy distribution), but I cannot have it worked in GATE. Is that possible and how ?
> >
> > Thank you,
> >
> > Yannick
> >
> >
> >
> >
> > _______________________________________________
> > Gate-users mailing list
> > Gate-users at lists.opengatecollaboration.org
> > http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
> >
> >
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