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Forum: Run Management
Re: None Simulating a 'lump' of radioactive material
Date: 20 Jun, 2014
From: Michael H. Kelsey <Michael H. Kelsey>

On Thu, 19 Jun 2014 16:40:28 GMT, FT wrote:
> I have a rather irregular 'lump' of radioactive material which I want to
> simulate decays from. Is there anyway, using the radioactivity tools,

No, there isn't. In Geant4, "materials" (i.e., physical volumes with an associated G4Material) are inert backgrounds through which particles travel. Radioactivity is associated with single particles, either placed by G4ParticleGun et al., or created in the course of the simulation.

> Or, do I use to use gps to generate the gun particles as best i can
> throughout the volume as per the examples?

If your 'lump' can be approximated by a simple shape, then you can use GPS. If you need the details (e.g., a hemispherical blob with high and low points), then you should probably write your own generator class, where you find a random point in your volume of interest, and pass that to G4ParticleGun.

   -- Michel Kelsey

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