[Gate-users] (no subject)

[Geron Bindseil]

Hello Lupa,

My understanding is that the position of the source is independent of the
position of the phantom volumes, unless you specifically attach or confine
the source to one of the phantom volumes.

The location of the cold area for the purposes of the Forbid command is
independent of the source position. The coordinates of the cold area are
set with respect to the coordinates of its mother volume, and in your case
the world volume is the mother volume. You should try to avoid overlapping
volumes. If there is a small area you'd like to forbid inside a medium area
of activity, set the source to be the same size as the medium area and then
make the small area a daughter of the medium area and then use the forbid
command on the small area.

Lastly, it is possible to have a source without a phantom.

Kind Regards,
Geron
--
Geron Bindseil
PhD Candidate, Physics
University of Western Ontario
London, Ontario, Canada
gbindsei at uwo.ca
On Wed, Nov 9, 2011 at 4:46 AM, lupa euy <lupalagieuy at yahoo.com> wrote:

> hi everyone..
>
>
> I have some 'stupid' questions.. Hope that someone can help me..
>
>
> 1. In the forbid command, for example you define a volume as in the
> example..
>
>
> /gate/world/daughters/name cold_area
> /gate/world/daughters/insert cylinder
> /gate/cold_area/vis/forceWireframe
> /gate/cold_area/vis/setColor green
> /gate/cold_area/geometry/setRmax 3.0 cm
> /gate/cold_area/geometry/setHeight 1. cm
>
> Then you describe your source with the Forbid command:
> /gate/source/addSource number1
> /gate/source/number1/setActivity 100000. becquerel
> /gate/source/number1/gps/particle gamma
> /gate/source/number1/setType backtoback
> /gate/source/number1/gps/type Volume
> /gate/source/number1/gps/shape Cylinder
> /gate/source/number1/gps/radius 5. cm
> /gate/source/number1/gps/halfz 0.5 cm
> /gate/source/number1/gps/centre 0. 0. 0. cm
> /gate/source/number1/gps/monoenergy 511. keV
> /gate/source/number1/gps/angtype iso
> /gate/source/number1/gps/Forbid cold_area
> /gate/source/number1/dump 1
> /gate/source/list
> How will we know the position of the cold area relative to the source ?
> Will the volume of the cold area follows the center of the source ?
>
> If we want to have the cold area to be off-centre, and use the
> setTranslation command, where will the position of x,y and z in that
> command refer to ?  relative to the world ? or relative to the source ?
>
>
> 2. Can we have a source without defining a phantom? If we have define the
> phantom as well, can we define the position of source relative to the
> phantom ? should we 'attach' the source to the phantom ??
>
> Thanks for your help. .
>
>
> regards
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