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

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

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1 None: Re: activity in Geant4   (Nur Aman - 01 Dec, 2014)
(_ None: Re: activity in Geant4   (michel maire - 02 Dec, 2014)
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