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Dear Atiq,
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<div class="">Geant4 puts secondary particles on a stack, and when a particle is finished being tracked picks up the last particle that was put there.</div>
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<div class="">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.</div>
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<div class="">So the behaviour that your image documents seems quite natural.</div>
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<div class="">Regards,</div>
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<div class="">John</div>
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<div class="">John Apostolakis, EP Department, CERN</div>
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<div class="">On 15 Oct 2019, at 23:57, Atiq Ur Rahman <<a href="mailto:atiqchep@gmail.com" class="">atiqchep@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Dear Users,
<div class="">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. </div>
<div class="">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.</div>
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<div class=""><span id="cid:ii_k1sd3nqk0"><image.png></span><br class="">
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<div class="">I am attaching a situation when timestamp of next hit is smaller than previous time.</div>
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<div class=""><span id="cid:ii_k1sdxwhc1"><image.png></span><br class="">
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<div class="">Can you explain that with what reference timestamp is generated in Gate? </div>
<div class="">Regards</div>
<div class="">Atiq</div>
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