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Forum: Biasing and Scoring
Re: Question Energy deposited by secondaries not adding up
Date: Jan 18, 06:35
From: michel maire <michel maire>

On Fri, 18 Jan 2019 10:42:50 GMT, fceraudo wrote:
> Hello everyone,
> 
> I am trying to track all the particles generated by incoming X-ray
> photons in a silicon detector. An hit is registered in the hit
> collection at every step and for every particle (event ID, position,
> deposited energy, particle type...). The geometry is very simple: just a
> piece of Si in vacuum, thick enough to ensure the total absorption of
> the primary photons. The physics list I use is Shielding_EMZ. The
> production threshold (cut) is down to 1 um.
> 
> If I shoot a 10 keV photon (the value is just an example), it is
> absorbed and produces a bunch of electrons, as expected: the energy
> deposited by all the particles, if summed up, gets 10 keV. Nothing
> strange here.
> 
> If I increase the number to 10 primaries, again nothing out of the
> ordinary. At 100 primary photons, however, I start seeing things like 99
> events depositing 10 keV and 1 event depositing 3 keV, which looks a bit
> worrisome. At 10k primaries (all of which having 10 keV), I get a
> continuous distribution from 0 to 33 keV peaked at 9 keV.
> 
> Any thoughts explaining the reason for this?
> 

  example TestEm5 with  macro  essai.mac.txt
  I attach output and plot.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2019/01/18/06.34-92645-essai.mac.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2019/01/18/06.34-58247-essai.out.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2019/01/18/06.34-18106-essai.gif

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1 Question: Re: Energy deposited by secondaries not adding up   (fceraudo - Jan 18, 09:25)
(_ None: Re: Energy deposited by secondaries not adding up   (michel maire - Jan 18, 10:40)
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