[gate-users] about the acolinearity of two gamma photons

Sebastien JAN jan at shfj.cea.fr
Mon Jun 6 10:36:34 CEST 2005

Hi Yuxuan,

>  1. If a backtoback gamma source is used, is the acolinearity be simulated?

No, the acolinearity class is called only for e+e- annihilation

>  2. If a isotope source is used, (F18, O15, etc), is the acolinearity be 
> simulated?

Yes, in this case the acolinearity is always simulated.

> but in the Physics Reference Manual of Geant4, the acolinearity should 
> be calculated in
> Geant4.

Could you send me the page where you have read this information in the 
G4 guide ? (or the class name which simulates this process)


> Anyone can give some explainations about that? Thanks.
> Yuxuan ZHANG
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