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

[John Apostolakis]

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<mailto: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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