|Message: Re: activity in Geant4||Not Logged In (login)|
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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 <email@example.com> 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 > [ MIME part of type text/html without a name stripped ]
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