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Forum: Medical Applications
Re: None activity in Geant4 (Nurama)
Re: None Re: activity in Geant4 (michel maire)
Date: 01 Dec, 2014
From: Nurama <Nurama>

Hi Dear Michel,

Thank you very much for the reply. I got it!

I have one related question: I used the following codes for simulating
positron emission. However, the two codes gave me different counts. Aren't
they not the same?
which one is the correct one?

1 G4ParticleDefinition* particle = particleTable->FindParticle("e+");

particleGun->SetParticleEnergy(0*keV);

and

2 G4ParticleDefinition* particle = particleTable->GetIon(9,18,0);  //F-18

 particleGun->SetParticleEnergy(0.*keV);


does the second one represent a decay?



Thank you again!


NUR





On Mon, Dec 1, 2014 at 6:18 PM, michel maire <michel.maire@lapp.in2p3.fr>
wrote:

>
> *** Discussion title: Medical Applications
>
> On Wed, 26 Nov 2014 10:12:11 GMT, Nur Aman wrote:
>
> > Hello Dear all,
> >
> > I am a bit new for geant4, and I am simulating a PET scanner. I have one
> > question regarding to activity setting. Can run/beamOn is the same as
> > activity in Becquerel? that is,
> >
> > If I want I to simulate an activity of 1000 Bq (Becquerel), can this be
> > done using beamOn? i.e.
> >
> > is "beamOn 1000" is the same as "1000 Bq"?
>
>  Not exactly. beamOn is the number of atoms which will decay. Therefore it
> is the population at t=0  : N0
>  The relation is : N0 = activity*half_time_life/ln2
>  You must know the half_time_life of your isotope.
>
>       Michel
>
> -------------------------------------------------------------
> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or
> unsubscribe) at:
>
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/medical_app/354/1.html
>

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