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Forum: Hadronic Processes
Re: Question How can I define the radioactive decay of Tc-99m to Tc-99? (Georgios Savvidis)
Date: Feb 21, 03:33
From: michel maire <michel maire>

On Wed, 20 Feb 2019 11:59:17 GMT, Georgios Savvidis wrote:
> Hello everyone!
> 
> I am trying to simulate the radioactive decay of the metastable isotope
> Tc-99m and I use the following code.
> 
>  G4int Z = 43, A = 99;
>  G4double ionCharge   = 0.*eplus;
>  G4double excitEnergy = 142.6833*keV;
> 
>  G4ParticleDefinition* ion
>  = G4ParticleTable::GetParticleTable()->GetIon(Z,A,excitEnergy);
> 
> Moreover, I read the answer of a relevant question in the forum, and I
> used also the command
> 
>  /grdm/nucleusLimits 100 100 43 43
> 
> as the answer suggested. However, in my simulation I see plenty of
> electrons, and only about 4-5% of gammas instead to observe the pure
> decay of Tc-99m to Tc-99. So, I suppose the simulation reflects the
> decay of Tc-99m to Tc-99 and Ru-99 and no only the decay to Tc-99. Does
> anyone knows how can I fix the problem and simulate only the decay of
> Tc-99m to Tc-99? I will appreciate any help :)
> 

 Hello,

 1- the attached macro (for rdecay01) shows that the command /grdm/nucleusLimits has same effect that fullChain = false

 2- It is true that, in 10.4, the number of internal conversions is rather big : ~97%. This number seems to me suspicious. I do not know if it has been updated or not in 10.5.

      Michel

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2019/02/21/03.30-7706-Tc99m.mac.txt

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1 None: Re: How can I define the radioactive decay of Tc-99m to Tc-99?   (Georgios Savvidis - Feb 22, 08:21)
(_ None: Re: How can I define the radioactive decay of Tc-99m to Tc-99?   (michel maire - Feb 23, 10:58)
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