[Gate-users] Description of eventID, TrackID and parentID when attach a sensitive detector

[Atiq Ur Rahman]

Hi John,
 Thank you so much for your nice explanation.  I got the Idea of the track
ID but I am still confuse with the trackLocalTime track local time
variable. What is the reference of each time stamp?
 I actually want to calculate the clustering time (rough time needed to
deposit all the energy of the particle entered into the detector). Let say,
we have a gamma of 4.4 MeV. it hit the detector having pdgEncoding=22, it
produces many hits in different crystals. I calculate the cluster
size(number of distinct hits in the all crystals). I also want to calculate
the time required for the formation of the cluster. Simply say, time needed
to deposit all the energy of the incident particles. In my opinion, gammas
may have short clustering time than heavy particles. Is any way to do this
calculation?
Regards
Atiq

On Wed, Oct 16, 2019 at 5:03 PM John Apostolakis <John.Apostolakis at cern.ch>
wrote:

> Dear Atiq,
>
> Geant4 puts secondary particles on a stack, and when a particle is
> finished being tracked picks up the last particle that was put there.
>
> Once all the secondaries of the last particle have been dealt with
> (assuming that they did not create secondaries themselves) then the next
> particle that was created by the parent of that last particle will be
> processed.
>
> So the behaviour that your image documents seems quite natural.
>
> Regards,
> John
> ===================================================
> John Apostolakis,  EP Department, CERN
>
> On 15 Oct 2019, at 23:57, Atiq Ur Rahman <atiqchep at gmail.com> wrote:
>
> Dear Users,
> I am using a proton beam on a PE phantom and put PET scanner and attach a
> sensitive detector with it. I have printed the data column wise. How to
> understand parentID and trackID.
> In my understanding parentID is the ID of the mother particle causing
> current hit. Time is in  increasing sequences some how but some time, it
> is smaller then the previous hit.
> <image.png>
> I am attaching a situation when timestamp of next hit is smaller than
> previous time.
> <image.png>
> Can you explain that with what reference timestamp is generated in Gate?
> Regards
> Atiq
>
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