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Forum: Geometry
Re: Question Concentric spheres (Baljeet Seniwal)
Date: Nov 27, 02:35
From: Evgueni Tcherniaev <Evgueni Tcherniaev>

Dear Baljeet,

I would suggest to use G4Orb instead of G4Sphere. It is faster and more robust, the warnings should disappear.

It is perfectly fine to use mother-daughter concentric orbs with different materials to define a spherical shell.

I do not think that you need to use Replica. Anyway it is not related with the warnings.

Hope this helps, Evgueni

On Fri, 23 Nov 2018 19:01:42 GMT, Baljeet Seniwal wrote:

> Dear all
> 
> I am trying to modify svalue example of Geant4-DNA project. It provides
> only one sphere as an absorber. I am trying to to make modifications to
> it by placing 3 concentric spheres 1. world sphere radius 10. micrometer
> 2. Cell with outer radius 5. micrometer, inner radius = (5.micrometer -
> 7. nm), made of Tissue material. 3. Nucleus with outer radius (0.8 X 5.
> )micrometer, inner radius = (outer radius - 40. nm), made of Tissue
> material.
> 
> My first question is do I need to use Replica class or parametrization
> class for this geometry? If yes, can you please guide me?
> 
> Because I used simple world daughter geometry
> 
> World is mother to Cell and Cell is mother to the nucleus.
> 
> I am getting results but I am also getting the warnings. I have attached
> the warnings and model geometry with this massage. Any type of
> suggestion will be appreciated.
> 
>    Attachment:
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/11/23/11.00-47840-Cell.png
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/11/23/11.00-82859-Modell.png
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/11/23/11.00-43712-error1.png
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/11/23/11.00-88038-Error2.png
> 

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