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Question Re: G4ParticleGun and radiogenics -- is "particle_momentum_direction" used? 

Forum: Fast Simulation, Transportation & Others
Re: Question G4ParticleGun vs. G4GeneralParticleSource: radiogenics, distributed sources (Michael H. Kelsey)
Re: None Re: G4ParticleGun vs. G4GeneralParticleSource: radiogenics, distributed sources (michel maire)
Date: 26 Apr, 2011
From: Michael H. Kelsey <Michael H. Kelsey>

On Tue, 26 Apr 2011 09:51:11 GMT, michel maire wrote:
> On Sat, 23 Apr 2011 05:44:30 GMT, Michael H. Kelsey wrote:
> > Does anyone have an example I could look at which is analogous to either
> > of these scenarios? Is GPS the right way for me to go, or should I code
> > up my own implementations (throwing random positions in my volume, etc.)
> > using G4ParticleGun?
> >
>  2- radioactivedecay/rdecay01 use radioactive ion as particle gun

Hi, Michel. I have a question about this example.

In our source holder, the Am-241 "hockey puck" is up against a lead collimator, with a small (200 um) hole to let the gammas out. When I set the particleGun to have zero energy (i.e., the ions are at rest), does the momentum direction have any meaning?

In particular, is it passed on to RadioactiveDecay in such a way that the daughters only come out in that direction? Or am I going to have to generate a large number of "useless" events in order to get a few which actually make it through the collimator and into our detector?

-- Mike

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