[Gate-users] Ion source - timestamp problem GATE 6.1

[Enrique Muñoz Albaladejo]

Thank you very much for your response, the problem seems to be exactly 
as you describe it. It looks like it ignores any time settings I define 
and takes the time of the simulation to be that which makes the source 
run out of activity.

I have encountered this problem when simulating a Na22 source with GATE 
7.1 and geant4.10.01.p02, and a colleague of mine has the same problem 
with GATE 6.1 and Geant4 9.4 (she wanted to simulate 176 Lutetium).

I tried to read through the Geant4 code and I can't figure out why the 
function SetPDGLifeTime() would ignore the attempt to modify the 
lifetime of an ion, but my programming knowledge isn't that deep.

Thanks again.

Enrique Muñoz

On 04/01/16 09:37, STRYDHORST Jared wrote:
> What version of GATE and Geant4 are you using and what ion?
> GATE schedules the decay of ions itself according to the activity set 
> by the user. To do so, it calls a function that sets the lifetime of 
> the ion in Geant4 to zero so it decays immediately when it's created. 
> However, in version 10 (.1?, .2? I don't know exactly when the change 
> was made.) of Geant4, the function (SetPDGLifeTime()) now ignores any 
> attempts to modify the lifetime of an ion. So the ion is created by 
> GATE, but then Geant4 calculates the decay time according to the real 
> half-life of the ion.
>
> Jared STRYDHORST
>
> Laboratoire Imagerie Moléculaire In Vivo (IMIV)
> UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS
> CEA/I2BM/Service Hospitalier Frédéric Joliot
> 4, place du Général Leclerc
> 91401 ORSAY Cedex
>
> <mailto:karima.ait-aissa at cea.fr>
> http://i2bm.cea.fr/dsv/i2bm/shfj/imiv
> ------------------------------------------------------------------------
> *De :* gate-users-bounces at lists.opengatecollaboration.org 
> [gate-users-bounces at lists.opengatecollaboration.org] de la part de 
> Enrique Muñoz Albaladejo [Enrique.Munoz at ific.uv.es]
> *Envoyé :* lundi 21 décembre 2015 12:32
> *À :* gate-users at lists.opengatecollaboration.org
> *Objet :* [Gate-users] Ion source - timestamp problem GATE 6.1
>
> Dear all,
>
>
> I am trying to use an ion source for a PETscanner.
>
> The simulation provides strange values for the time stamp of the singles.
> The parameter  "setTimeStop"  was set to 50s, but the timestamp of the 
> first detected single was 3.4x10^17 s.
>
> I would like to know if there is any solution to this problem.
>
> Best regards,
>
> Enrique

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20160112/590a4677/attachment-0001.html>