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Question radioactive isotope decay simulation 

Forum: Physics List
Date: 13 Apr, 2004
From: Hongjie Liang <>

Hi all,

Please take a look at my case:

What I want to do is to simulate a F-18 source (positron decay)inside a uniform phantom, and study its energy distribution.

Here are a few problems I encountered:

1)I used the "G4BetaPlusDecayChannel" method to construct my F-18 source. 
  I set verbosity to be 2, from the info it printed out, it seemed that 
  the source was successfully constructed. But for some reason, the 
  particles didn't interact with the medium, the trajectories were drawn 
  in blue (I am not quite sure what the particles are), no hits were captured. 
  I did register the beta+/beta- annihilation process, but why no gamma
  rays came out?

2)When we construct our particlegun with isotope source, do we need to 
  specify the momentum? Without a given momentum,I found the particles always come 
  out in one single direction.

3)Since the decay scheme for each radioactive isotope is definite, why
  do we need to specify it by ourselves? Is there a way that if I give the
  type of the isotope, the program will do all for me?

4)How to distribute the isotope inside the phantom in the particular way
  we want?

Can anyone tell me where I could find any example code on this topic? I really appreciate it.

Thanks again,


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1 None: Re: radioactive isotope decay simulation   (Wellisch, J.P. - 28 Apr, 2004)
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